Replace Atomic32 with webrtc/base/atomicops.h.

webrtc/call/transport_adapter.h

 /*
  *  Copyright (c) 2013 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_CALL_TRANSPORT_ADAPTER_H_
 #define WEBRTC_CALL_TRANSPORT_ADAPTER_H_
 
 #include "webrtc/common_types.h"
-#include "webrtc/system_wrappers/interface/atomic32.h"
+
 #include "webrtc/transport.h"
 
 namespace webrtc {
 namespace internal {
 
 class TransportAdapter : public webrtc::Transport {
  public:
   explicit TransportAdapter(newapi::Transport* transport);
 
   int SendPacket(const void* packet, size_t length) override;
   int SendRTCPPacket(const void* packet, size_t length) override;
 
   void Enable();
   void Disable();
 
  private:
   newapi::Transport *transport_;
-  Atomic32 enabled_;
+  volatile int enabled_;
 };
 }  // namespace internal
 }  // namespace webrtc
 
 #endif  // WEBRTC_CALL_TRANSPORT_ADAPTER_H_