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

webrtc/modules/audio_device/linux/audio_mixer_manager_pulse_linux.h

 /*
  *  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.
  */
 
@@ skipping 93 matching lines @@
     mutable uint32_t _paMute;
     mutable uint32_t _paVolSteps;
     bool _paSpeakerMute;
     mutable uint32_t _paSpeakerVolume;
     mutable uint8_t _paChannels;
     bool _paObjectsSet;
 
     // Stores thread ID in constructor.
     // We can then use ThreadChecker::CalledOnValidThread() to ensure that
     // other methods are called from the same thread.
-    // Currently only does DCHECK(thread_checker_.CalledOnValidThread()).
+    // Currently only does RTC_DCHECK(thread_checker_.CalledOnValidThread()).
     rtc::ThreadChecker thread_checker_;
 };
 
 }
 
 #endif  // MODULES_AUDIO_DEVICE_MAIN_SOURCE_LINUX_AUDIO_MIXER_MANAGER_PULSE_LINUX_H_