Update thread annotiation macros in modules to use RTC_ prefix

webrtc/modules/audio_processing/level_estimator_impl.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 20 matching lines @@
   void Initialize();
   void ProcessStream(AudioBuffer* audio);
 
   // LevelEstimator implementation.
   int Enable(bool enable) override;
   bool is_enabled() const override;
   int RMS() override;
 
  private:
   rtc::CriticalSection* const crit_ = nullptr;
-  bool enabled_ GUARDED_BY(crit_) = false;
-  std::unique_ptr<RmsLevel> rms_ GUARDED_BY(crit_);
+  bool enabled_ RTC_GUARDED_BY(crit_) = false;
+  std::unique_ptr<RmsLevel> rms_ RTC_GUARDED_BY(crit_);
   RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(LevelEstimatorImpl);
 };
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_PROCESSING_LEVEL_ESTIMATOR_IMPL_H_