Update thread annotiation macros in modules to use RTC_ prefix

webrtc/modules/video_coding/generic_encoder.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 59 matching lines @@
   bool internal_source_;
   EncodedImageCallback* const post_encode_callback_;
   media_optimization::MediaOptimization* const media_opt_;
 
   struct TimingFramesLayerInfo {
     size_t target_bitrate_bytes_per_sec = 0;
     std::map<int64_t, int64_t> encode_start_time_ms;
   };
   // Separate instance for each simulcast stream or spatial layer.
   std::vector<TimingFramesLayerInfo> timing_frames_info_
-      GUARDED_BY(timing_params_lock_);
-  size_t framerate_ GUARDED_BY(timing_params_lock_);
-  int64_t last_timing_frame_time_ms_ GUARDED_BY(timing_params_lock_);
+      RTC_GUARDED_BY(timing_params_lock_);
+  size_t framerate_ RTC_GUARDED_BY(timing_params_lock_);
+  int64_t last_timing_frame_time_ms_ RTC_GUARDED_BY(timing_params_lock_);
   VideoCodec::TimingFrameTriggerThresholds timing_frames_thresholds_
-      GUARDED_BY(timing_params_lock_);
+      RTC_GUARDED_BY(timing_params_lock_);
 
   // Experiment groups parsed from field trials for realtime video ([0]) and
   // screenshare ([1]). 0 means no group specified. Positive values are
   // experiment group numbers incremented by 1.
   uint8_t experiment_groups_[2];
 };
 
 class VCMGenericEncoder {
   friend class VCMCodecDataBase;
 
@@ skipping 15 matching lines @@
 
   int32_t SetPeriodicKeyFrames(bool enable);
   int32_t RequestFrame(const std::vector<FrameType>& frame_types);
   bool InternalSource() const;
   void OnDroppedFrame();
   bool SupportsNativeHandle() const;
 
  private:
   rtc::RaceChecker race_checker_;
 
-  VideoEncoder* const encoder_ GUARDED_BY(race_checker_);
+  VideoEncoder* const encoder_ RTC_GUARDED_BY(race_checker_);
   VCMEncodedFrameCallback* const vcm_encoded_frame_callback_;
   const bool internal_source_;
   rtc::CriticalSection params_lock_;
-  EncoderParameters encoder_params_ GUARDED_BY(params_lock_);
+  EncoderParameters encoder_params_ RTC_GUARDED_BY(params_lock_);
   bool is_screenshare_;
   size_t streams_or_svc_num_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_VIDEO_CODING_GENERIC_ENCODER_H_