Update thread annotiation macros to use RTC_ prefix

webrtc/media/base/videobroadcaster.h

 /*
  *  Copyright (c) 2016 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 33 matching lines @@
   // aggregated by all VideoSinkWants from all sinks.
   VideoSinkWants wants() const;
 
   // This method ensures that if a sink sets rotation_applied == true,
   // it will never receive a frame with pending rotation. Our caller
   // may pass in frames without precise synchronization with changes
   // to the VideoSinkWants.
   void OnFrame(const webrtc::VideoFrame& frame) override;
 
  protected:
-  void UpdateWants() EXCLUSIVE_LOCKS_REQUIRED(sinks_and_wants_lock_);
+  void UpdateWants() RTC_EXCLUSIVE_LOCKS_REQUIRED(sinks_and_wants_lock_);
   const rtc::scoped_refptr<webrtc::VideoFrameBuffer>& GetBlackFrameBuffer(
-      int width, int height)
-      EXCLUSIVE_LOCKS_REQUIRED(sinks_and_wants_lock_);
+      int width,
+      int height) RTC_EXCLUSIVE_LOCKS_REQUIRED(sinks_and_wants_lock_);
 
   ThreadChecker thread_checker_;
   rtc::CriticalSection sinks_and_wants_lock_;
 
-  VideoSinkWants current_wants_ GUARDED_BY(sinks_and_wants_lock_);
+  VideoSinkWants current_wants_ RTC_GUARDED_BY(sinks_and_wants_lock_);
   rtc::scoped_refptr<webrtc::VideoFrameBuffer> black_frame_buffer_;
 };
 
 }  // namespace rtc
 
 #endif  // WEBRTC_MEDIA_BASE_VIDEOBROADCASTER_H_