Remove implementation of CriticalSectionWrapper and use rtc::CriticalSection

webrtc/system_wrappers/source/critical_section.cc

-/*
- *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#include "webrtc/system_wrappers/include/critical_section_wrapper.h"
-
-namespace webrtc {
-
-CriticalSectionWrapper* CriticalSectionWrapper::CreateCriticalSection() {
-  return new CriticalSectionWrapper();
-}
-
-#if defined (WEBRTC_WIN)
-
-CriticalSectionWrapper::CriticalSectionWrapper() {
-  InitializeCriticalSection(&crit_);
-}
-
-CriticalSectionWrapper::~CriticalSectionWrapper() {
-  DeleteCriticalSection(&crit_);
-}
-
-void CriticalSectionWrapper::Enter() {
-  EnterCriticalSection(&crit_);
-}
-
-void CriticalSectionWrapper::Leave() {
-  LeaveCriticalSection(&crit_);
-}
-
-#else
-
-CriticalSectionWrapper::CriticalSectionWrapper() {
-  pthread_mutexattr_t attr;
-  pthread_mutexattr_init(&attr);
-  pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
-  pthread_mutex_init(&mutex_, &attr);
-}
-
-CriticalSectionWrapper::~CriticalSectionWrapper() {
-  pthread_mutex_destroy(&mutex_);
-}
-
-void CriticalSectionWrapper::Enter() {
-  pthread_mutex_lock(&mutex_);
-}
-
-void CriticalSectionWrapper::Leave() {
-  pthread_mutex_unlock(&mutex_);
-}
-
-#endif
-
-}  // namespace webrtc