Update thread annotiation macros to use RTC_ prefix

webrtc/media/engine/fakewebrtcvideoengine.h

 /*
  *  Copyright (c) 2010 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 154 matching lines @@
   }
 
   int GetNumEncodedFrames() {
     rtc::CritScope lock(&crit_);
     return num_frames_encoded_;
   }
 
  private:
   rtc::CriticalSection crit_;
   rtc::Event init_encode_event_;
-  int num_frames_encoded_ GUARDED_BY(crit_);
-  webrtc::VideoCodec codec_settings_ GUARDED_BY(crit_);
+  int num_frames_encoded_ RTC_GUARDED_BY(crit_);
+  webrtc::VideoCodec codec_settings_ RTC_GUARDED_BY(crit_);
 };
 
 // Fake class for mocking out WebRtcVideoEncoderFactory.
 class FakeWebRtcVideoEncoderFactory : public WebRtcVideoEncoderFactory {
  public:
   FakeWebRtcVideoEncoderFactory()
       : created_video_encoder_event_(false, false),
         num_created_encoders_(0),
         encoders_have_internal_sources_(false) {}
 
@@ skipping 56 matching lines @@
 
   const std::vector<FakeWebRtcVideoEncoder*> encoders() {
     rtc::CritScope lock(&crit_);
     return encoders_;
   }
 
  private:
   rtc::CriticalSection crit_;
   rtc::Event created_video_encoder_event_;
   std::vector<cricket::VideoCodec> codecs_;
-  std::vector<FakeWebRtcVideoEncoder*> encoders_ GUARDED_BY(crit_);
-  int num_created_encoders_ GUARDED_BY(crit_);
+  std::vector<FakeWebRtcVideoEncoder*> encoders_ RTC_GUARDED_BY(crit_);
+  int num_created_encoders_ RTC_GUARDED_BY(crit_);
   bool encoders_have_internal_sources_;
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_MEDIA_ENGINE_FAKEWEBRTCVIDEOENGINE_H_