Remove mutable from rtc::CriticalSection members.

talk/media/devices/filevideocapturer.cc

 /*
  * libjingle
  * Copyright 2004 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 131 matching lines @@
   }
 
   // Check if Run() is finished.
   bool Finished() const {
     rtc::CritScope cs(&crit_);
     return finished_;
   }
 
  private:
   FileVideoCapturer* capturer_;
-  mutable rtc::CriticalSection crit_;
+  rtc::CriticalSection crit_;
   bool finished_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(FileReadThread);
 };
 
 /////////////////////////////////////////////////////////////////////
 // Implementation of class FileVideoCapturer
 /////////////////////////////////////////////////////////////////////
 static const int64_t kNumNanoSecsPerMilliSec = 1000000;
 const char* FileVideoCapturer::kVideoFileDevicePrefix = "video-file:";
@@ skipping 213 matching lines @@
     if (interval_ms > 0) {
       *wait_time_ms = interval_ms;
     }
   }
   // Keep the original timestamp read from the file.
   last_frame_timestamp_ns_ = captured_frame_.time_stamp;
   return true;
 }
 
 }  // namespace cricket