Add RTC_ prefix to (D)CHECKs and related macros.

webrtc/system_wrappers/source/critical_section_posix.cc

 /*
  *  Copyright (c) 2012 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.
  */
 
 // General note: return values for the various pthread synchronization APIs
 // are explicitly ignored here. In Chromium, the same thing is done for release.
-// However, in debugging, failure in these APIs are logged. There is currently
-// no equivalent to DCHECK_EQ in WebRTC code so this is the best we can do here.
+// However, in debugging, failure in these APIs are logged.
 // TODO(henrike): add logging when pthread synchronization APIs are failing.
 
 #include "webrtc/system_wrappers/source/critical_section_posix.h"
 
 namespace webrtc {
 
 CriticalSectionPosix::CriticalSectionPosix() {
   pthread_mutexattr_t attr;
   (void) pthread_mutexattr_init(&attr);
   (void) pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
   (void) pthread_mutex_init(&mutex_, &attr);
 }
 
 CriticalSectionPosix::~CriticalSectionPosix() {
   (void) pthread_mutex_destroy(&mutex_);
 }
 
 void
 CriticalSectionPosix::Enter() {
   (void) pthread_mutex_lock(&mutex_);
 }
 
 void
 CriticalSectionPosix::Leave() {
   (void) pthread_mutex_unlock(&mutex_);
 }
 
 }  // namespace webrtc