Remove mutable from rtc::CriticalSection members.

webrtc/base/stream.h

 /*
  *  Copyright 2004 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 537 matching lines @@
   // when calling this method.
   StreamResult WriteOffsetLocked(const void* buffer, size_t bytes,
                                  size_t offset, size_t* bytes_written);
 
   StreamState state_;  // keeps the opened/closed state of the stream
   scoped_ptr<char[]> buffer_;  // the allocated buffer
   size_t buffer_length_;  // size of the allocated buffer
   size_t data_length_;  // amount of readable data in the buffer
   size_t read_position_;  // offset to the readable data
   Thread* owner_;  // stream callbacks are dispatched on this thread
-  mutable CriticalSection crit_;  // object lock
+  CriticalSection crit_;  // object lock
   RTC_DISALLOW_COPY_AND_ASSIGN(FifoBuffer);
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 class LoggingAdapter : public StreamAdapterInterface {
  public:
   LoggingAdapter(StreamInterface* stream, LoggingSeverity level,
                  const std::string& label, bool hex_mode = false);
 
@@ skipping 125 matching lines @@
 // as a pass in parameter, it indicates data in buffer that should move to sink
 StreamResult Flow(StreamInterface* source,
                   char* buffer, size_t buffer_len,
                   StreamInterface* sink, size_t* data_len = NULL);
 
 ///////////////////////////////////////////////////////////////////////////////
 
 }  // namespace rtc
 
 #endif  // WEBRTC_BASE_STREAM_H_