Remove mutable from rtc::CriticalSection members.

webrtc/test/fake_network_pipe.h

 /*
  *  Copyright (c) 2012 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 53 matching lines @@
   int64_t TimeUntilNextProcess() const;
 
   // Get statistics.
   float PercentageLoss();
   int AverageDelay();
   size_t dropped_packets() { return dropped_packets_; }
   size_t sent_packets() { return sent_packets_; }
 
  private:
   Clock* const clock_;
-  mutable rtc::CriticalSection lock_;
+  rtc::CriticalSection lock_;
   PacketReceiver* packet_receiver_;
   std::queue<NetworkPacket*> capacity_link_;
   std::queue<NetworkPacket*> delay_link_;
 
   // Link configuration.
   Config config_;
 
   // Statistics.
   size_t dropped_packets_;
   size_t sent_packets_;
   int64_t total_packet_delay_;
 
   int64_t next_process_time_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(FakeNetworkPipe);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_TEST_FAKE_NETWORK_PIPE_H_