Update thread annotiation macros to use RTC_ prefix

webrtc/test/vcm_capturer.h

 /*
  *  Copyright (c) 2013 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.
  */
 #ifndef WEBRTC_TEST_VCM_CAPTURER_H_
@@ skipping 31 matching lines @@
 
  private:
   VcmCapturer();
   bool Init(size_t width,
             size_t height,
             size_t target_fps,
             size_t capture_device_index);
   void Destroy();
 
   rtc::CriticalSection crit_;
-  bool started_ GUARDED_BY(crit_);
-  rtc::VideoSinkInterface<VideoFrame>* sink_ GUARDED_BY(crit_);
+  bool started_ RTC_GUARDED_BY(crit_);
+  rtc::VideoSinkInterface<VideoFrame>* sink_ RTC_GUARDED_BY(crit_);
   rtc::scoped_refptr<VideoCaptureModule> vcm_;
   VideoCaptureCapability capability_;
 };
 
 }  // test
 }  // webrtc
 
 #endif  // WEBRTC_TEST_VCM_CAPTURER_H_