Replace Atomic32 with webrtc/base/atomicops.h.

webrtc/system_wrappers/interface/ref_count.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.
  */
 
 #ifndef SYSTEM_WRAPPERS_INTERFACE_REF_COUNT_H_
 #define SYSTEM_WRAPPERS_INTERFACE_REF_COUNT_H_
 
-#include "webrtc/system_wrappers/interface/atomic32.h"
+#include "webrtc/base/atomicops.h"
 
 namespace webrtc {
 
 // This class can be used for instantiating
 // reference counted objects.
 // int32_t AddRef() and int32_t Release().
 // Usage:
 // RefCountImpl<T>* implementation = new RefCountImpl<T>(p);
 //
 // Example:
@@ skipping 29 matching lines @@
   template<typename P1, typename P2, typename P3>
   RefCountImpl(P1 p1, P2 p2, P3 p3) : T(p1, p2, p3), ref_count_(0) {}
 
   template<typename P1, typename P2, typename P3, typename P4>
   RefCountImpl(P1 p1, P2 p2, P3 p3, P4 p4) : T(p1, p2, p3, p4), ref_count_(0) {}
 
   template<typename P1, typename P2, typename P3, typename P4, typename P5>
   RefCountImpl(P1 p1, P2 p2, P3 p3, P4 p4, P5 p5)
       : T(p1, p2, p3, p4, p5), ref_count_(0) {}
 
-  virtual int32_t AddRef() {
-    return ++ref_count_;
-  }
+  virtual int32_t AddRef() { return rtc::AtomicOps::Increment(&ref_count_); }
 
   virtual int32_t Release() {
     int32_t ref_count;
-    ref_count = --ref_count_;
+    ref_count = rtc::AtomicOps::Decrement(&ref_count_);
     if (ref_count == 0)
       delete this;
     return ref_count;
   }
 
  protected:
-  Atomic32 ref_count_;
+  volatile int ref_count_;
 };
 
 }  // namespace webrtc
 
 #endif  // SYSTEM_WRAPPERS_INTERFACE_REF_COUNT_H_