Remove mutable from rtc::CriticalSection members.

webrtc/modules/video_coding/codecs/vp9/vp9_frame_buffer_pool.h

 /*
  *  Copyright (c) 2015 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.
  *
  */
 
-#ifndef WEBRTC_MODULES_VIDEO_CODING_CODECS_VP9_FRAME_BUFFER_POOL_H_
-#define WEBRTC_MODULES_VIDEO_CODING_CODECS_VP9_FRAME_BUFFER_POOL_H_
+#ifndef WEBRTC_MODULES_VIDEO_CODING_CODECS_VP9_VP9_FRAME_BUFFER_POOL_H_
+#define WEBRTC_MODULES_VIDEO_CODING_CODECS_VP9_VP9_FRAME_BUFFER_POOL_H_
 
 #include <vector>
 
 #include "webrtc/base/basictypes.h"
 #include "webrtc/base/buffer.h"
 #include "webrtc/base/criticalsection.h"
 #include "webrtc/base/refcount.h"
 #include "webrtc/base/scoped_ref_ptr.h"
 
 struct vpx_codec_ctx;
@@ skipping 72 matching lines @@
   // finished using one of the pool's frame buffer. Parameters:
   // |user_priv| Private data passed to libvpx, InitializeVpxUsePool sets it up
   //             to be a pointer to the pool.
   // |fb|        Pointer to the libvpx frame buffer object, its |priv| will be
   //             a pointer to one of the pool's Vp9FrameBuffer.
   static int32_t VpxReleaseFrameBuffer(void* user_priv,
                                        vpx_codec_frame_buffer* fb);
 
  private:
   // Protects |allocated_buffers_|.
-  mutable rtc::CriticalSection buffers_lock_;
+  rtc::CriticalSection buffers_lock_;
   // All buffers, in use or ready to be recycled.
   std::vector<rtc::scoped_refptr<Vp9FrameBuffer>> allocated_buffers_
       GUARDED_BY(buffers_lock_);
   // If more buffers than this are allocated we print warnings, and crash if
   // in debug mode.
   static const size_t max_num_buffers_ = 10;
 };
 
 }  // namespace webrtc
 
-#endif  // WEBRTC_MODULES_VIDEO_CODING_CODECS_VP9_FRAME_BUFFER_POOL_H_
+#endif  // WEBRTC_MODULES_VIDEO_CODING_CODECS_VP9_VP9_FRAME_BUFFER_POOL_H_