Replace Atomic32 with webrtc/base/atomicops.h.

webrtc/modules/desktop_capture/mac/desktop_configuration_monitor.h

Index: webrtc/modules/desktop_capture/mac/desktop_configuration_monitor.h
diff --git a/webrtc/modules/desktop_capture/mac/desktop_configuration_monitor.h b/webrtc/modules/desktop_capture/mac/desktop_configuration_monitor.h
index fe6f01beb9a4373a6499fa21f7690cafda0c6bf3..bf276eb5aa17b89adb94e3ca5729c2e025a9b110 100644
--- a/webrtc/modules/desktop_capture/mac/desktop_configuration_monitor.h
+++ b/webrtc/modules/desktop_capture/mac/desktop_configuration_monitor.h
@@ -15,9 +15,9 @@
 
 #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 {
 
@@ -38,9 +38,9 @@ class DesktopConfigurationMonitor {
     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;
   }
 
@@ -53,7 +53,7 @@ class 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_;