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diff --git a/third_party/protobuf/3.6.0/python/google/protobuf/pyext/extension_dict.h b/third_party/protobuf/3.6.0/python/google/protobuf/pyext/extension_dict.h
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+// 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.
+
+// Author: anuraag@google.com (Anuraag Agrawal)
+// Author: tibell@google.com (Johan Tibell)
+
+#ifndef GOOGLE_PROTOBUF_PYTHON_CPP_EXTENSION_DICT_H__
+#define GOOGLE_PROTOBUF_PYTHON_CPP_EXTENSION_DICT_H__
+
+#include <Python.h>
+
+#include <memory>
+
+#include <google/protobuf/pyext/message.h>
+
+namespace google {
+namespace protobuf {
+
+class Message;
+class FieldDescriptor;
+
+namespace python {
+
+typedef struct ExtensionDict {
+  PyObject_HEAD;
+
+  // This is the top-level C++ Message object that owns the whole
+  // proto tree.  Every Python container class holds a
+  // reference to it in order to keep it alive as long as there's a
+  // Python object that references any part of the tree.
+  CMessage::OwnerRef owner;
+
+  // Weak reference to parent message. Used to make sure
+  // the parent is writable when an extension field is modified.
+  CMessage* parent;
+
+  // Pointer to the C++ Message that this ExtensionDict extends.
+  // Not owned by us.
+  Message* message;
+
+  // A dict of child messages, indexed by Extension descriptors.
+  // Similar to CMessage::composite_fields.
+  PyObject* values;
+} ExtensionDict;
+
+extern PyTypeObject ExtensionDict_Type;
+
+namespace extension_dict {
+
+// Builds an Extensions dict for a specific message.
+ExtensionDict* NewExtensionDict(CMessage *parent);
+
+}  // namespace extension_dict
+}  // namespace python
+}  // namespace protobuf
+
+}  // namespace google
+#endif  // GOOGLE_PROTOBUF_PYTHON_CPP_EXTENSION_DICT_H__