Mojo C++ bindings: remove the utility/ folder.

mojo/public/cpp/utility/mutex.h

-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef MOJO_PUBLIC_CPP_UTILITY_MUTEX_H_
-#define MOJO_PUBLIC_CPP_UTILITY_MUTEX_H_
-
-#ifdef _WIN32
-#error "Not implemented: See crbug.com/342893."
-#endif
-
-#include <pthread.h>
-
-#include "base/macros.h"
-#include "mojo/public/cpp/system/macros.h"
-
-namespace mojo {
-
-#ifdef NDEBUG
-// Note: Make a C++ constant for |PTHREAD_MUTEX_INITIALIZER|. (We can't directly
-// use the C macro in an initializer list, since it might expand to |{ ... }|.)
-namespace internal {
-const pthread_mutex_t kPthreadMutexInitializer = PTHREAD_MUTEX_INITIALIZER;
-}
-#endif
-
-class Mutex {
- public:
-#ifdef NDEBUG
-  Mutex() : mutex_(internal::kPthreadMutexInitializer) {}
-  ~Mutex() { pthread_mutex_destroy(&mutex_); }
-
-  void Lock() { pthread_mutex_lock(&mutex_); }
-  void Unlock() { pthread_mutex_unlock(&mutex_); }
-  bool TryLock() { return pthread_mutex_trylock(&mutex_) == 0; }
-
-  void AssertHeld() {}
-#else
-  Mutex();
-  ~Mutex();
-
-  void Lock();
-  void Unlock();
-  bool TryLock();
-
-  void AssertHeld();
-#endif
-
- private:
-  pthread_mutex_t mutex_;
-
-  DISALLOW_COPY_AND_ASSIGN(Mutex);
-};
-
-class MutexLock {
- public:
-  explicit MutexLock(Mutex* mutex) : mutex_(mutex) { mutex_->Lock(); }
-  ~MutexLock() { mutex_->Unlock(); }
-
- private:
-  Mutex* const mutex_;
-
-  DISALLOW_COPY_AND_ASSIGN(MutexLock);
-};
-
-// Catch bug where variable name is omitted (e.g., |MutexLock (&mu)|).
-#define MutexLock(x) static_assert(0, "MutexLock() missing variable name");
-
-}  // namespace mojo
-
-#endif  // MOJO_PUBLIC_CPP_UTILITY_MUTEX_H_