Use one scoped_refptr.

webrtc/modules/audio_device/win/audio_device_core_win.h

Index: webrtc/modules/audio_device/win/audio_device_core_win.h
diff --git a/webrtc/modules/audio_device/win/audio_device_core_win.h b/webrtc/modules/audio_device/win/audio_device_core_win.h
index 7fe92ac2e9ee0ece71f577b2f0d637d4d52a34e2..8d37006da951d91a4a5986060cbc2e4a27ca074f 100644
--- a/webrtc/modules/audio_device/win/audio_device_core_win.h
+++ b/webrtc/modules/audio_device/win/audio_device_core_win.h
@@ -24,8 +24,8 @@
 #include <endpointvolume.h>
 #include <mediaobj.h>        // IMediaObject
 
+#include "webrtc/base/scoped_ref_ptr.h"
 #include "webrtc/system_wrappers/interface/critical_section_wrapper.h"
-#include "webrtc/system_wrappers/interface/scoped_refptr.h"
 
 // Use Multimedia Class Scheduler Service (MMCSS) to boost the thread priority
 #pragma comment( lib, "avrt.lib" )
@@ -296,8 +296,8 @@ private:  // WASAPI
     ISimpleAudioVolume*                     _ptrRenderSimpleVolume;
 
     // DirectX Media Object (DMO) for the built-in AEC.
-    scoped_refptr<IMediaObject>             _dmo;
-    scoped_refptr<IMediaBuffer>             _mediaBuffer;
+    rtc::scoped_refptr<IMediaObject> _dmo;
+    rtc::scoped_refptr<IMediaBuffer> _mediaBuffer;
     bool                                    _builtInAecEnabled;
 
     HANDLE                                  _hRenderSamplesReadyEvent;