Update thread annotiation macros in modules to use RTC_ prefix

webrtc/modules/audio_coding/codecs/isac/locked_bandwidth_info.h

 /*
  *  Copyright (c) 2015 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 30 matching lines @@
     const int count = rtc::AtomicOps::Decrement(&ref_count_);
     if (count == 0) {
       delete this;
     }
     return count;
   }
 
  private:
   mutable volatile int ref_count_;
   rtc::CriticalSection lock_;
-  IsacBandwidthInfo bwinfo_ GUARDED_BY(lock_);
+  IsacBandwidthInfo bwinfo_ RTC_GUARDED_BY(lock_);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_CODING_CODECS_ISAC_LOCKED_BANDWIDTH_INFO_H_