Replace Atomic32 with webrtc/base/atomicops.h.

webrtc/modules/desktop_capture/x11/shared_x_display.h

Index: webrtc/modules/desktop_capture/x11/shared_x_display.h
diff --git a/webrtc/modules/desktop_capture/x11/shared_x_display.h b/webrtc/modules/desktop_capture/x11/shared_x_display.h
index 02755450fc28e019e4ab5a94f580513abbbf55d2..91ba92b8bf64e503b7d3f8e9dd02266c226ca198 100644
--- a/webrtc/modules/desktop_capture/x11/shared_x_display.h
+++ b/webrtc/modules/desktop_capture/x11/shared_x_display.h
@@ -19,8 +19,9 @@
 
 #include <string>
 
+#include "webrtc/base/atomicops.h"
+#include "webrtc/base/constructormagic.h"
 #include "webrtc/base/scoped_ref_ptr.h"
-#include "webrtc/system_wrappers/interface/atomic32.h"
 
 namespace webrtc {
 
@@ -48,9 +49,9 @@ class SharedXDisplay {
   // DISPLAY). NULL is returned if X11 connection failed.
   static rtc::scoped_refptr<SharedXDisplay> CreateDefault();
 
-  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;
   }
 
@@ -71,7 +72,7 @@ class SharedXDisplay {
 
   ~SharedXDisplay();
 
-  Atomic32 ref_count_;
+  volatile int ref_count_;
   Display* display_;
 
   EventHandlersMap event_handlers_;