Update thread annotiation macros in modules to use RTC_ prefix

webrtc/modules/video_coding/utility/quality_scaler.h

 /*
  *  Copyright (c) 2014 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 53 matching lines @@
                 int64_t sampling_period);
 
  private:
   class CheckQPTask;
   void CheckQP();
   void ClearSamples();
   void ReportQPLow();
   void ReportQPHigh();
   int64_t GetSamplingPeriodMs() const;
 
-  CheckQPTask* check_qp_task_ GUARDED_BY(&task_checker_);
-  AdaptationObserverInterface* const observer_ GUARDED_BY(&task_checker_);
+  CheckQPTask* check_qp_task_ RTC_GUARDED_BY(&task_checker_);
+  AdaptationObserverInterface* const observer_ RTC_GUARDED_BY(&task_checker_);
   rtc::SequencedTaskChecker task_checker_;
 
   const int64_t sampling_period_ms_;
-  bool fast_rampup_ GUARDED_BY(&task_checker_);
-  MovingAverage average_qp_ GUARDED_BY(&task_checker_);
-  MovingAverage framedrop_percent_ GUARDED_BY(&task_checker_);
+  bool fast_rampup_ RTC_GUARDED_BY(&task_checker_);
+  MovingAverage average_qp_ RTC_GUARDED_BY(&task_checker_);
+  MovingAverage framedrop_percent_ RTC_GUARDED_BY(&task_checker_);
 
-  VideoEncoder::QpThresholds thresholds_ GUARDED_BY(&task_checker_);
+  VideoEncoder::QpThresholds thresholds_ RTC_GUARDED_BY(&task_checker_);
 };
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_VIDEO_CODING_UTILITY_QUALITY_SCALER_H_