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diff --git a/third_party/protobuf/src/google/protobuf/stubs/once.h b/third_party/protobuf/src/google/protobuf/stubs/once.h
deleted file mode 100644
index 1f082c37e9..0000000000
--- a/third_party/protobuf/src/google/protobuf/stubs/once.h
+++ /dev/null
@@ -1,167 +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.
-
-// Author: kenton@google.com (Kenton Varda)
-//
-// emulates google3/base/once.h
-//
-// This header is intended to be included only by internal .cc files and
-// generated .pb.cc files.  Users should not use this directly.
-//
-// This is basically a portable version of pthread_once().
-//
-// This header declares:
-// * A type called ProtobufOnceType.
-// * A macro GOOGLE_PROTOBUF_DECLARE_ONCE() which declares a variable of type
-//   ProtobufOnceType.  This is the only legal way to declare such a variable.
-//   The macro may only be used at the global scope (you cannot create local or
-//   class member variables of this type).
-// * A function GoogleOnceInit(ProtobufOnceType* once, void (*init_func)()).
-//   This function, when invoked multiple times given the same ProtobufOnceType
-//   object, will invoke init_func on the first call only, and will make sure
-//   none of the calls return before that first call to init_func has finished.
-// * The user can provide a parameter which GoogleOnceInit() forwards to the
-//   user-provided function when it is called. Usage example:
-//     int a = 10;
-//     GoogleOnceInit(&my_once, &MyFunctionExpectingIntArgument, &a);
-// * This implementation guarantees that ProtobufOnceType is a POD (i.e. no
-//   static initializer generated).
-//
-// This implements a way to perform lazy initialization.  It's more efficient
-// than using mutexes as no lock is needed if initialization has already
-// happened.
-//
-// Example usage:
-//   void Init();
-//   GOOGLE_PROTOBUF_DECLARE_ONCE(once_init);
-//
-//   // Calls Init() exactly once.
-//   void InitOnce() {
-//     GoogleOnceInit(&once_init, &Init);
-//   }
-//
-// Note that if GoogleOnceInit() is called before main() has begun, it must
-// only be called by the thread that will eventually call main() -- that is,
-// the thread that performs dynamic initialization.  In general this is a safe
-// assumption since people don't usually construct threads before main() starts,
-// but it is technically not guaranteed.  Unfortunately, Win32 provides no way
-// whatsoever to statically-initialize its synchronization primitives, so our
-// only choice is to assume that dynamic initialization is single-threaded.
-
-#ifndef GOOGLE_PROTOBUF_STUBS_ONCE_H__
-#define GOOGLE_PROTOBUF_STUBS_ONCE_H__
-
-#include <google/protobuf/stubs/atomicops.h>
-#include <google/protobuf/stubs/callback.h>
-#include <google/protobuf/stubs/common.h>
-
-namespace google {
-namespace protobuf {
-
-#ifdef GOOGLE_PROTOBUF_NO_THREAD_SAFETY
-
-typedef bool ProtobufOnceType;
-
-#define GOOGLE_PROTOBUF_ONCE_INIT false
-
-inline void GoogleOnceInit(ProtobufOnceType* once, void (*init_func)()) {
-  if (!*once) {
-    *once = true;
-    init_func();
-  }
-}
-
-template <typename Arg>
-inline void GoogleOnceInit(ProtobufOnceType* once, void (*init_func)(Arg),
-    Arg arg) {
-  if (!*once) {
-    *once = true;
-    init_func(arg);
-  }
-}
-
-#else
-
-enum {
-  ONCE_STATE_UNINITIALIZED = 0,
-  ONCE_STATE_EXECUTING_CLOSURE = 1,
-  ONCE_STATE_DONE = 2
-};
-
-typedef internal::AtomicWord ProtobufOnceType;
-
-#define GOOGLE_PROTOBUF_ONCE_INIT ::google::protobuf::ONCE_STATE_UNINITIALIZED
-
-LIBPROTOBUF_EXPORT
-void GoogleOnceInitImpl(ProtobufOnceType* once, Closure* closure);
-
-inline void GoogleOnceInit(ProtobufOnceType* once, void (*init_func)()) {
-  if (internal::Acquire_Load(once) != ONCE_STATE_DONE) {
-    internal::FunctionClosure0 func(init_func, false);
-    GoogleOnceInitImpl(once, &func);
-  }
-}
-
-template <typename Arg>
-inline void GoogleOnceInit(ProtobufOnceType* once, void (*init_func)(Arg*),
-    Arg* arg) {
-  if (internal::Acquire_Load(once) != ONCE_STATE_DONE) {
-    internal::FunctionClosure1<Arg*> func(init_func, false, arg);
-    GoogleOnceInitImpl(once, &func);
-  }
-}
-
-#endif  // GOOGLE_PROTOBUF_NO_THREAD_SAFETY
-
-class GoogleOnceDynamic {
- public:
-  GoogleOnceDynamic() : state_(GOOGLE_PROTOBUF_ONCE_INIT) { }
-
-  // If this->Init() has not been called before by any thread,
-  // execute (*func_with_arg)(arg) then return.
-  // Otherwise, wait until that prior invocation has finished
-  // executing its function, then return.
-  template<typename T>
-  void Init(void (*func_with_arg)(T*), T* arg) {
-    GoogleOnceInit<T>(&this->state_,
-                      func_with_arg,
-                      arg);
-  }
- private:
-  ProtobufOnceType state_;
-};
-
-#define GOOGLE_PROTOBUF_DECLARE_ONCE(NAME) \
-  ::google::protobuf::ProtobufOnceType NAME = GOOGLE_PROTOBUF_ONCE_INIT
-
-}  // namespace protobuf
-}  // namespace google
-
-#endif  // GOOGLE_PROTOBUF_STUBS_ONCE_H__