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diff --git a/src/google/protobuf/stubs/mutex.h b/src/google/protobuf/stubs/mutex.h
deleted file mode 100644
index 7ef1cb69..00000000
--- a/src/google/protobuf/stubs/mutex.h
+++ /dev/null
@@ -1,148 +0,0 @@
-// Copyright (c) 2006, Google Inc.
-// All rights reserved.
-//
-// 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.
-
-#ifndef GOOGLE_PROTOBUF_STUBS_MUTEX_H_
-#define GOOGLE_PROTOBUF_STUBS_MUTEX_H_
-
-#ifdef GOOGLE_PROTOBUF_NO_THREADLOCAL
-#include <pthread.h>
-#endif
-
-#include <google/protobuf/stubs/macros.h>
-
-// ===================================================================
-// emulates google3/base/mutex.h
-namespace google {
-namespace protobuf {
-namespace internal {
-
-// A Mutex is a non-reentrant (aka non-recursive) mutex.  At most one thread T
-// may hold a mutex at a given time.  If T attempts to Lock() the same Mutex
-// while holding it, T will deadlock.
-class LIBPROTOBUF_EXPORT Mutex {
- public:
-  // Create a Mutex that is not held by anybody.
-  Mutex();
-
-  // Destructor
-  ~Mutex();
-
-  // Block if necessary until this Mutex is free, then acquire it exclusively.
-  void Lock();
-
-  // Release this Mutex.  Caller must hold it exclusively.
-  void Unlock();
-
-  // Crash if this Mutex is not held exclusively by this thread.
-  // May fail to crash when it should; will never crash when it should not.
-  void AssertHeld();
-
- private:
-  struct Internal;
-  Internal* mInternal;
-
-  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(Mutex);
-};
-
-// Undefine the macros  to workaround the conflicts with Google internal
-// MutexLock implementation.
-// TODO(liujisi): Remove the undef once internal macros are removed.
-#undef MutexLock
-#undef ReaderMutexLock
-#undef WriterMutexLock
-#undef MutexLockMaybe
-
-// MutexLock(mu) acquires mu when constructed and releases it when destroyed.
-class LIBPROTOBUF_EXPORT MutexLock {
- public:
-  explicit MutexLock(Mutex *mu) : mu_(mu) { this->mu_->Lock(); }
-  ~MutexLock() { this->mu_->Unlock(); }
- private:
-  Mutex *const mu_;
-  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MutexLock);
-};
-
-// TODO(kenton):  Implement these?  Hard to implement portably.
-typedef MutexLock ReaderMutexLock;
-typedef MutexLock WriterMutexLock;
-
-// MutexLockMaybe is like MutexLock, but is a no-op when mu is NULL.
-class LIBPROTOBUF_EXPORT MutexLockMaybe {
- public:
-  explicit MutexLockMaybe(Mutex *mu) :
-    mu_(mu) { if (this->mu_ != NULL) { this->mu_->Lock(); } }
-  ~MutexLockMaybe() { if (this->mu_ != NULL) { this->mu_->Unlock(); } }
- private:
-  Mutex *const mu_;
-  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MutexLockMaybe);
-};
-
-#if defined(GOOGLE_PROTOBUF_NO_THREADLOCAL)
-template<typename T>
-class ThreadLocalStorage {
- public:
-  ThreadLocalStorage() {
-    pthread_key_create(&key_, &ThreadLocalStorage::Delete);
-  }
-  ~ThreadLocalStorage() {
-    pthread_key_delete(key_);
-  }
-  T* Get() {
-    T* result = static_cast<T*>(pthread_getspecific(key_));
-    if (result == NULL) {
-      result = new T();
-      pthread_setspecific(key_, result);
-    }
-    return result;
-  }
- private:
-  static void Delete(void* value) {
-    delete static_cast<T*>(value);
-  }
-  pthread_key_t key_;
-
-  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ThreadLocalStorage);
-};
-#endif
-
-}  // namespace internal
-
-// We made these internal so that they would show up as such in the docs,
-// but we don't want to stick "internal::" in front of them everywhere.
-using internal::Mutex;
-using internal::MutexLock;
-using internal::ReaderMutexLock;
-using internal::WriterMutexLock;
-using internal::MutexLockMaybe;
-
-
-}  // namespace protobuf
-}  // namespace google
-
-#endif  // GOOGLE_PROTOBUF_STUBS_MUTEX_H_