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diff --git a/third_party/protobuf/java/core/src/main/java/com/google/protobuf/ExtensionRegistry.java b/third_party/protobuf/java/core/src/main/java/com/google/protobuf/ExtensionRegistry.java
deleted file mode 100644
index a22a74a03c..0000000000
--- a/third_party/protobuf/java/core/src/main/java/com/google/protobuf/ExtensionRegistry.java
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@@ -1,396 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-package com.google.protobuf;
-
-import com.google.protobuf.Descriptors.Descriptor;
-import com.google.protobuf.Descriptors.FieldDescriptor;
-import java.util.Collection;
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.HashSet;
-import java.util.Map;
-import java.util.Set;
-
-/**
- * A table of known extensions, searchable by name or field number.  When
- * parsing a protocol message that might have extensions, you must provide
- * an {@code ExtensionRegistry} in which you have registered any extensions
- * that you want to be able to parse.  Otherwise, those extensions will just
- * be treated like unknown fields.
- *
- * <p>For example, if you had the {@code .proto} file:
- *
- * <pre>
- * option java_class = "MyProto";
- *
- * message Foo {
- *   extensions 1000 to max;
- * }
- *
- * extend Foo {
- *   optional int32 bar;
- * }
- * </pre>
- *
- * Then you might write code like:
- *
- * <pre>
- * ExtensionRegistry registry = ExtensionRegistry.newInstance();
- * registry.add(MyProto.bar);
- * MyProto.Foo message = MyProto.Foo.parseFrom(input, registry);
- * </pre>
- *
- * <p>Background:
- *
- * <p>You might wonder why this is necessary.  Two alternatives might come to
- * mind.  First, you might imagine a system where generated extensions are
- * automatically registered when their containing classes are loaded.  This
- * is a popular technique, but is bad design; among other things, it creates a
- * situation where behavior can change depending on what classes happen to be
- * loaded.  It also introduces a security vulnerability, because an
- * unprivileged class could cause its code to be called unexpectedly from a
- * privileged class by registering itself as an extension of the right type.
- *
- * <p>Another option you might consider is lazy parsing: do not parse an
- * extension until it is first requested, at which point the caller must
- * provide a type to use.  This introduces a different set of problems.  First,
- * it would require a mutex lock any time an extension was accessed, which
- * would be slow.  Second, corrupt data would not be detected until first
- * access, at which point it would be much harder to deal with it.  Third, it
- * could violate the expectation that message objects are immutable, since the
- * type provided could be any arbitrary message class.  An unprivileged user
- * could take advantage of this to inject a mutable object into a message
- * belonging to privileged code and create mischief.
- *
- * @author kenton@google.com Kenton Varda
- */
-public class ExtensionRegistry extends ExtensionRegistryLite {
-  /** Construct a new, empty instance. */
-  public static ExtensionRegistry newInstance() {
-    return new ExtensionRegistry();
-  }
-
-  /** Get the unmodifiable singleton empty instance. */
-  public static ExtensionRegistry getEmptyRegistry() {
-    return EMPTY_REGISTRY;
-  }
-
-
-  /** Returns an unmodifiable view of the registry. */
-  @Override
-  public ExtensionRegistry getUnmodifiable() {
-    return new ExtensionRegistry(this);
-  }
-
-  /** A (Descriptor, Message) pair, returned by lookup methods. */
-  public static final class ExtensionInfo {
-    /** The extension's descriptor. */
-    public final FieldDescriptor descriptor;
-
-    /**
-     * A default instance of the extension's type, if it has a message type.
-     * Otherwise, {@code null}.
-     */
-    public final Message defaultInstance;
-
-    private ExtensionInfo(final FieldDescriptor descriptor) {
-      this.descriptor = descriptor;
-      defaultInstance = null;
-    }
-    private ExtensionInfo(final FieldDescriptor descriptor,
-                          final Message defaultInstance) {
-      this.descriptor = descriptor;
-      this.defaultInstance = defaultInstance;
-    }
-  }
-
-  /**
-   * Deprecated. Use {@link #findImmutableExtensionByName(String)} instead.
-   */
-  public ExtensionInfo findExtensionByName(final String fullName) {
-    return findImmutableExtensionByName(fullName);
-  }
-
-  /**
-   * Find an extension for immutable APIs by fully-qualified field name,
-   * in the proto namespace. i.e. {@code result.descriptor.fullName()} will
-   * match {@code fullName} if a match is found.
-   *
-   * @return Information about the extension if found, or {@code null}
-   *         otherwise.
-   */
-  public ExtensionInfo findImmutableExtensionByName(final String fullName) {
-    return immutableExtensionsByName.get(fullName);
-  }
-
-  /**
-   * Find an extension for mutable APIs by fully-qualified field name,
-   * in the proto namespace. i.e. {@code result.descriptor.fullName()} will
-   * match {@code fullName} if a match is found.
-   *
-   * @return Information about the extension if found, or {@code null}
-   *         otherwise.
-   */
-  public ExtensionInfo findMutableExtensionByName(final String fullName) {
-    return mutableExtensionsByName.get(fullName);
-  }
-
-  /**
-   * Deprecated. Use {@link #findImmutableExtensionByNumber(
-   * Descriptors.Descriptor, int)}
-   */
-  public ExtensionInfo findExtensionByNumber(
-      final Descriptor containingType, final int fieldNumber) {
-    return findImmutableExtensionByNumber(containingType, fieldNumber);
-  }
-
-  /**
-   * Find an extension by containing type and field number for immutable APIs.
-   *
-   * @return Information about the extension if found, or {@code null}
-   *         otherwise.
-   */
-  public ExtensionInfo findImmutableExtensionByNumber(
-      final Descriptor containingType, final int fieldNumber) {
-    return immutableExtensionsByNumber.get(
-      new DescriptorIntPair(containingType, fieldNumber));
-  }
-
-  /**
-   * Find an extension by containing type and field number for mutable APIs.
-   *
-   * @return Information about the extension if found, or {@code null}
-   *         otherwise.
-   */
-  public ExtensionInfo findMutableExtensionByNumber(
-      final Descriptor containingType, final int fieldNumber) {
-    return mutableExtensionsByNumber.get(
-        new DescriptorIntPair(containingType, fieldNumber));
-  }
-
-  /**
-   * Find all extensions for mutable APIs by fully-qualified name of
-   * extended class. Note that this method is more computationally expensive
-   * than getting a single extension by name or number.
-   *
-   * @return Information about the extensions found, or {@code null} if there
-   *     are none.
-   */
-  public Set<ExtensionInfo> getAllMutableExtensionsByExtendedType(final String fullName) {
-    HashSet<ExtensionInfo> extensions = new HashSet<ExtensionInfo>();
-    for (DescriptorIntPair pair : mutableExtensionsByNumber.keySet()) {
-      if (pair.descriptor.getFullName().equals(fullName)) {
-        extensions.add(mutableExtensionsByNumber.get(pair));
-      }
-    }
-    return extensions;
-  }
-
-  /**
-   * Find all extensions for immutable APIs by fully-qualified name of
-   * extended class. Note that this method is more computationally expensive
-   * than getting a single extension by name or number.
-   *
-   * @return Information about the extensions found, or {@code null} if there
-   *     are none.
-   */
-  public Set<ExtensionInfo> getAllImmutableExtensionsByExtendedType(final String fullName) {
-    HashSet<ExtensionInfo> extensions = new HashSet<ExtensionInfo>();
-    for (DescriptorIntPair pair : immutableExtensionsByNumber.keySet()) {
-      if (pair.descriptor.getFullName().equals(fullName)) {
-        extensions.add(immutableExtensionsByNumber.get(pair));
-      }
-    }
-    return extensions;
-  }
-
-  /** Add an extension from a generated file to the registry. */
-  public void add(final Extension<?, ?> extension) {
-    if (extension.getExtensionType() != Extension.ExtensionType.IMMUTABLE &&
-        extension.getExtensionType() != Extension.ExtensionType.MUTABLE) {
-      // do not support other extension types. ignore
-      return;
-    }
-    add(newExtensionInfo(extension), extension.getExtensionType());
-  }
-
-  /** Add an extension from a generated file to the registry. */
-  public void add(final GeneratedMessage.GeneratedExtension<?, ?> extension) {
-    add((Extension<?, ?>) extension);
-  }
-
-  static ExtensionInfo newExtensionInfo(final Extension<?, ?> extension) {
-    if (extension.getDescriptor().getJavaType() ==
-        FieldDescriptor.JavaType.MESSAGE) {
-      if (extension.getMessageDefaultInstance() == null) {
-        throw new IllegalStateException(
-            "Registered message-type extension had null default instance: " +
-                extension.getDescriptor().getFullName());
-      }
-      return new ExtensionInfo(extension.getDescriptor(),
-          (Message) extension.getMessageDefaultInstance());
-    } else {
-      return new ExtensionInfo(extension.getDescriptor(), null);
-    }
-  }
-
-  /** Add a non-message-type extension to the registry by descriptor. */
-  public void add(final FieldDescriptor type) {
-    if (type.getJavaType() == FieldDescriptor.JavaType.MESSAGE) {
-      throw new IllegalArgumentException(
-        "ExtensionRegistry.add() must be provided a default instance when " +
-        "adding an embedded message extension.");
-    }
-    ExtensionInfo info = new ExtensionInfo(type, null);
-    add(info, Extension.ExtensionType.IMMUTABLE);
-    add(info, Extension.ExtensionType.MUTABLE);
-  }
-
-  /** Add a message-type extension to the registry by descriptor. */
-  public void add(final FieldDescriptor type, final Message defaultInstance) {
-    if (type.getJavaType() != FieldDescriptor.JavaType.MESSAGE) {
-      throw new IllegalArgumentException(
-        "ExtensionRegistry.add() provided a default instance for a " +
-        "non-message extension.");
-    }
-      add(new ExtensionInfo(type, defaultInstance),
-          Extension.ExtensionType.IMMUTABLE);
-  }
-
-  // =================================================================
-  // Private stuff.
-
-  private ExtensionRegistry() {
-    this.immutableExtensionsByName = new HashMap<String, ExtensionInfo>();
-    this.mutableExtensionsByName = new HashMap<String, ExtensionInfo>();
-    this.immutableExtensionsByNumber =
-        new HashMap<DescriptorIntPair, ExtensionInfo>();
-    this.mutableExtensionsByNumber =
-        new HashMap<DescriptorIntPair, ExtensionInfo>();
-  }
-
-  private ExtensionRegistry(ExtensionRegistry other) {
-    super(other);
-    this.immutableExtensionsByName =
-        Collections.unmodifiableMap(other.immutableExtensionsByName);
-    this.mutableExtensionsByName =
-        Collections.unmodifiableMap(other.mutableExtensionsByName);
-    this.immutableExtensionsByNumber =
-        Collections.unmodifiableMap(other.immutableExtensionsByNumber);
-    this.mutableExtensionsByNumber =
-            Collections.unmodifiableMap(other.mutableExtensionsByNumber);
-  }
-
-  private final Map<String, ExtensionInfo> immutableExtensionsByName;
-  private final Map<String, ExtensionInfo> mutableExtensionsByName;
-  private final Map<DescriptorIntPair, ExtensionInfo> immutableExtensionsByNumber;
-  private final Map<DescriptorIntPair, ExtensionInfo> mutableExtensionsByNumber;
-
-  ExtensionRegistry(boolean empty) {
-    super(EMPTY_REGISTRY_LITE);
-    this.immutableExtensionsByName =
-        Collections.<String, ExtensionInfo>emptyMap();
-    this.mutableExtensionsByName =
-        Collections.<String, ExtensionInfo>emptyMap();
-    this.immutableExtensionsByNumber =
-        Collections.<DescriptorIntPair, ExtensionInfo>emptyMap();
-    this.mutableExtensionsByNumber =
-            Collections.<DescriptorIntPair, ExtensionInfo>emptyMap();
-  }
-  static final ExtensionRegistry EMPTY_REGISTRY = new ExtensionRegistry(true);
-
-  private void add(
-      final ExtensionInfo extension,
-      final Extension.ExtensionType extensionType) {
-    if (!extension.descriptor.isExtension()) {
-      throw new IllegalArgumentException(
-          "ExtensionRegistry.add() was given a FieldDescriptor for a regular " +
-              "(non-extension) field.");
-    }
-
-    Map<String, ExtensionInfo> extensionsByName;
-    Map<DescriptorIntPair, ExtensionInfo> extensionsByNumber;
-    switch (extensionType) {
-      case IMMUTABLE:
-        extensionsByName = immutableExtensionsByName;
-        extensionsByNumber = immutableExtensionsByNumber;
-        break;
-      case MUTABLE:
-        extensionsByName = mutableExtensionsByName;
-        extensionsByNumber = mutableExtensionsByNumber;
-        break;
-      default:
-        // Ignore the unknown supported type.
-        return;
-    }
-
-    extensionsByName.put(extension.descriptor.getFullName(), extension);
-    extensionsByNumber.put(
-      new DescriptorIntPair(extension.descriptor.getContainingType(),
-                            extension.descriptor.getNumber()),
-      extension);
-
-    final FieldDescriptor field = extension.descriptor;
-    if (field.getContainingType().getOptions().getMessageSetWireFormat() &&
-        field.getType() == FieldDescriptor.Type.MESSAGE &&
-        field.isOptional() &&
-        field.getExtensionScope() == field.getMessageType()) {
-      // This is an extension of a MessageSet type defined within the extension
-      // type's own scope.  For backwards-compatibility, allow it to be looked
-      // up by type name.
-      extensionsByName.put(field.getMessageType().getFullName(), extension);
-    }
-  }
-
-  /** A (GenericDescriptor, int) pair, used as a map key. */
-  private static final class DescriptorIntPair {
-    private final Descriptor descriptor;
-    private final int number;
-
-    DescriptorIntPair(final Descriptor descriptor, final int number) {
-      this.descriptor = descriptor;
-      this.number = number;
-    }
-
-    @Override
-    public int hashCode() {
-      return descriptor.hashCode() * ((1 << 16) - 1) + number;
-    }
-    @Override
-    public boolean equals(final Object obj) {
-      if (!(obj instanceof DescriptorIntPair)) {
-        return false;
-      }
-      final DescriptorIntPair other = (DescriptorIntPair)obj;
-      return descriptor == other.descriptor && number == other.number;
-    }
-  }
-}