Remove mutable from rtc::CriticalSection members.

webrtc/video/overuse_frame_detector.h

 /*
  *  Copyright (c) 2013 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 101 matching lines @@
 
   bool FrameTimeoutDetected(int64_t now) const EXCLUSIVE_LOCKS_REQUIRED(crit_);
   bool FrameSizeChanged(int num_pixels) const EXCLUSIVE_LOCKS_REQUIRED(crit_);
 
   void ResetAll(int num_pixels) EXCLUSIVE_LOCKS_REQUIRED(crit_);
 
   // Protecting all members except const and those that are only accessed on the
   // processing thread.
   // TODO(asapersson): See if we can reduce locking.  As is, video frame
   // processing contends with reading stats and the processing thread.
-  mutable rtc::CriticalSection crit_;
+  rtc::CriticalSection crit_;
 
   const CpuOveruseOptions options_;
 
   // Observer getting overuse reports.
   CpuOveruseObserver* const observer_;
 
   // Stats metrics.
   CpuOveruseMetricsObserver* const metrics_observer_;
   CpuOveruseMetrics metrics_ GUARDED_BY(crit_);
 
@@ skipping 22 matching lines @@
   const rtc::scoped_ptr<FrameQueue> frame_queue_ GUARDED_BY(crit_);
 
   rtc::ThreadChecker processing_thread_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(OveruseFrameDetector);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_VIDEO_OVERUSE_FRAME_DETECTOR_H_