Replace Atomic32 with webrtc/base/atomicops.h.

webrtc/modules/desktop_capture/mac/desktop_configuration_monitor.h

 /*
  *  Copyright (c) 2014 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_DESKTOP_CAPTURE_MAC_DESKTOP_CONFIGURATION_MONITOR_H_
 #define WEBRTC_MODULES_DESKTOP_CAPTURE_MAC_DESKTOP_CONFIGURATION_MONITOR_H_
 
 #include <ApplicationServices/ApplicationServices.h>
 
 #include <set>
 
+#include "webrtc/base/atomicops.h"
 #include "webrtc/base/scoped_ptr.h"
 #include "webrtc/modules/desktop_capture/mac/desktop_configuration.h"
-#include "webrtc/system_wrappers/interface/atomic32.h"
 
 namespace webrtc {
 
 class EventWrapper;
 
 // The class provides functions to synchronize capturing and display
 // reconfiguring across threads, and the up-to-date MacDesktopConfiguration.
 class DesktopConfigurationMonitor {
  public:
   DesktopConfigurationMonitor();
   // Acquires a lock on the current configuration.
   void Lock();
   // Releases the lock previously acquired.
   void Unlock();
   // Returns the current desktop configuration. Should only be called when the
   // lock has been acquired.
   const MacDesktopConfiguration& desktop_configuration() {
     return desktop_configuration_;
   }
 
-  void AddRef() { ++ref_count_; }
+  void AddRef() { rtc::AtomicOps::Increment(&ref_count_); }
   void Release() {
-    if (--ref_count_ == 0)
+    if (rtc::AtomicOps::Decrement(&ref_count_) == 0)
       delete this;
   }
 
  private:
   static void DisplaysReconfiguredCallback(CGDirectDisplayID display,
                                            CGDisplayChangeSummaryFlags flags,
                                            void *user_parameter);
   ~DesktopConfigurationMonitor();
 
   void DisplaysReconfigured(CGDirectDisplayID display,
                             CGDisplayChangeSummaryFlags flags);
 
-  Atomic32 ref_count_;
+  volatile int ref_count_;
   std::set<CGDirectDisplayID> reconfiguring_displays_;
   MacDesktopConfiguration desktop_configuration_;
   rtc::scoped_ptr<EventWrapper> display_configuration_capture_event_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(DesktopConfigurationMonitor);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_DESKTOP_CAPTURE_MAC_DESKTOP_CONFIGURATION_MONITOR_H_