Replace Atomic32 with webrtc/base/atomicops.h.

webrtc/test/channel_transport/udp_socket2_manager_win.h

Index: webrtc/test/channel_transport/udp_socket2_manager_win.h
diff --git a/webrtc/test/channel_transport/udp_socket2_manager_win.h b/webrtc/test/channel_transport/udp_socket2_manager_win.h
index 7e4e805d0c241da46f6903ec72a727e4efcf0269..5846ad591b87004b300d0eec609f31e8837337e8 100644
--- a/webrtc/test/channel_transport/udp_socket2_manager_win.h
+++ b/webrtc/test/channel_transport/udp_socket2_manager_win.h
@@ -14,7 +14,7 @@
 #include <winsock2.h>
 #include <list>
 
-#include "webrtc/system_wrappers/interface/atomic32.h"
+#include "webrtc/base/atomicops.h"
 #include "webrtc/system_wrappers/interface/critical_section_wrapper.h"
 #include "webrtc/system_wrappers/interface/event_wrapper.h"
 #include "webrtc/system_wrappers/interface/thread_wrapper.h"
@@ -76,8 +76,9 @@ public:
     // Re-use an old unused IO context or create a new one.
     virtual PerIoContext* PopIoContext();
     virtual int32_t PushIoContext(PerIoContext* pIoContext);
-    virtual inline int32_t GetSize(uint32_t* inUse = 0)
-    {return _size.Value();}
+    virtual inline int32_t GetSize(uint32_t* inUse = 0) {
+      return rtc::AtomicOps::AcquireLoad(&_size);
+    }
     virtual int32_t Free();
 private:
     // Sample code for use of msfts single linked atomic list can be found here:
@@ -87,8 +88,8 @@ private:
     PSLIST_HEADER _pListHead;
 
     bool _init;
-    Atomic32 _size;
-    Atomic32 _inUse;
+    volatile int _size;
+    volatile int _inUse;
 };
 
 class UdpSocket2WorkerWindows