Replace Atomic32 with webrtc/base/atomicops.h.

webrtc/test/channel_transport/udp_socket2_win.h

Index: webrtc/test/channel_transport/udp_socket2_win.h
diff --git a/webrtc/test/channel_transport/udp_socket2_win.h b/webrtc/test/channel_transport/udp_socket2_win.h
index 5d6b212b93117c5dfdc1fa37fc3f086a4a819f0f..2685013c9fb3d67a4fabeb1b28eb01a3337b74b2 100644
--- a/webrtc/test/channel_transport/udp_socket2_win.h
+++ b/webrtc/test/channel_transport/udp_socket2_win.h
@@ -19,7 +19,7 @@
 #include <Ntddndis.h>
 #include <traffic.h>
 
-#include "webrtc/system_wrappers/interface/atomic32.h"
+#include "webrtc/base/atomicops.h"
 #include "webrtc/system_wrappers/interface/condition_variable_wrapper.h"
 #include "webrtc/system_wrappers/interface/critical_section_wrapper.h"
 #include "webrtc/system_wrappers/interface/event_wrapper.h"
@@ -76,7 +76,9 @@ public:
     int32_t SetTOS(const int32_t serviceType) override;
     int32_t SetPCP(const int32_t pcp) override;
 
-    uint32_t ReceiveBuffers() override { return _receiveBuffers.Value(); }
+    uint32_t ReceiveBuffers() override {
+      return rtc::AtomicOps::AcquireLoad(&_receiveBuffers);
+    }
 
 protected:
     void IOCompleted(PerIoContext* pIOContext, uint32_t ioSize, uint32_t error);
@@ -134,8 +136,8 @@ private:
     UdpSocket2ManagerWindows* _mgr;
 
     CriticalSectionWrapper* _pCrit;
-    Atomic32 _outstandingCalls;
-    Atomic32 _outstandingCallComplete;
+    volatile int _outstandingCalls;
+    volatile int _outstandingCallComplete;
     volatile bool _terminate;
     volatile bool _addedToMgr;
 
@@ -170,7 +172,7 @@ private:
     // Holds the current pcp value. Can be -2 or 0 - 7.
     int _pcp;
 
-    Atomic32 _receiveBuffers;
+    volatile int _receiveBuffers;
 };
 
 }  // namespace test