Update thread annotiation macros in modules to use RTC_ prefix

webrtc/modules/video_coding/video_coding_impl.cc

 /*
  *  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 54 matching lines @@
     rtc::CritScope lock(&cs_);
     if (callback_) {
       return callback_->OnEncodedImage(encoded_image, codec_specific_info,
                                        fragmentation);
     }
     return Result(Result::ERROR_SEND_FAILED);
   }
 
  private:
   rtc::CriticalSection cs_;
-  EncodedImageCallback* callback_ GUARDED_BY(cs_);
+  EncodedImageCallback* callback_ RTC_GUARDED_BY(cs_);
 };
 
 class VideoCodingModuleImpl : public VideoCodingModule {
  public:
   VideoCodingModuleImpl(Clock* clock,
                         EventFactory* event_factory,
                         NackSender* nack_sender,
                         KeyFrameRequestSender* keyframe_request_sender,
                         EncodedImageCallback* pre_decode_image_callback)
       : VideoCodingModule(),
@@ skipping 188 matching lines @@
 // new jitter buffer is in place.
 VideoCodingModule* VideoCodingModule::Create(Clock* clock,
                                              EventFactory* event_factory) {
   RTC_DCHECK(clock);
   RTC_DCHECK(event_factory);
   return new VideoCodingModuleImpl(clock, event_factory, nullptr, nullptr,
                                    nullptr);
 }
 
 }  // namespace webrtc