Replace Atomic32 with webrtc/base/atomicops.h.

webrtc/voice_engine/voice_engine_impl.h

Index: webrtc/voice_engine/voice_engine_impl.h
diff --git a/webrtc/voice_engine/voice_engine_impl.h b/webrtc/voice_engine/voice_engine_impl.h
index 07f29c37b9aa177323ea88d154d16673e32a204e..8921847e76cb42076b6ee76f2337947c84148dc7 100644
--- a/webrtc/voice_engine/voice_engine_impl.h
+++ b/webrtc/voice_engine/voice_engine_impl.h
@@ -11,8 +11,8 @@
 #ifndef WEBRTC_VOICE_ENGINE_VOICE_ENGINE_IMPL_H
 #define WEBRTC_VOICE_ENGINE_VOICE_ENGINE_IMPL_H
 
+#include "webrtc/base/atomicops.h"
 #include "webrtc/engine_configurations.h"
-#include "webrtc/system_wrappers/interface/atomic32.h"
 #include "webrtc/voice_engine/voe_base_impl.h"
 
 #ifdef WEBRTC_VOICE_ENGINE_AUDIO_PROCESSING_API
@@ -121,7 +121,9 @@ class VoiceEngineImpl : public voe::SharedData,  // Must be the first base class
         _ref_count(0),
         own_config_(owns_config ? config : NULL) {
   }
-  ~VoiceEngineImpl() override { assert(_ref_count.Value() == 0); }
+  ~VoiceEngineImpl() override {
+    assert(rtc::AtomicOps::AcquireLoad(&_ref_count) == 0);
+  }
 
   int AddRef();
 
@@ -129,7 +131,7 @@ class VoiceEngineImpl : public voe::SharedData,  // Must be the first base class
   int Release() override;
 
  private:
-  Atomic32 _ref_count;
+  volatile int _ref_count;
   rtc::scoped_ptr<const Config> own_config_;
 };