Remove mutable from rtc::CriticalSection members.

talk/app/webrtc/test/fakeaudiocapturemodule.h

 /*
  * libjingle
  * Copyright 2012 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 260 matching lines @@
   // Buffer for samples to send to the webrtc::AudioTransport.
   char send_buffer_[kNumberSamples * kNumberBytesPerSample];
 
   // Counter of frames received that have samples of high enough amplitude to
   // indicate that the frames are not faked somewhere in the audio pipeline
   // (e.g. by a jitter buffer).
   int frames_received_;
 
   // Protects variables that are accessed from process_thread_ and
   // the main thread.
-  mutable rtc::CriticalSection crit_;
+  rtc::CriticalSection crit_;
   // Protects |audio_callback_| that is accessed from process_thread_ and
   // the main thread.
   rtc::CriticalSection crit_callback_;
 };
 
 #endif  // TALK_APP_WEBRTC_TEST_FAKEAUDIOCAPTUREMODULE_H_