Remove mutable from rtc::CriticalSection members.

webrtc/base/physicalsocketserver.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 154 matching lines @@
 
   void UpdateLastError();
   void MaybeRemapSendError();
 
   static int TranslateOption(Option opt, int* slevel, int* sopt);
 
   PhysicalSocketServer* ss_;
   SOCKET s_;
   uint8_t enabled_events_;
   bool udp_;
-  mutable CriticalSection crit_;
+  CriticalSection crit_;
   int error_ GUARDED_BY(crit_);
   ConnState state_;
   AsyncResolver* resolver_;
 
 #if !defined(NDEBUG)
   std::string dbg_addr_;
 #endif
 };
 
 class SocketDispatcher : public Dispatcher, public PhysicalSocket {
@@ skipping 27 matching lines @@
   static int next_id_;
   int id_;
   bool signal_close_;
   int signal_err_;
 #endif // WEBRTC_WIN
 };
 
 } // namespace rtc
 
 #endif // WEBRTC_BASE_PHYSICALSOCKETSERVER_H__