Revert "Remove OwnPtr from Blink."

third_party/WebKit/Source/platform/mediastream/MediaStreamCenter.h

 /*
  * Copyright 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 17 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef MediaStreamCenter_h
 #define MediaStreamCenter_h
 
 #include "platform/PlatformExport.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/WebMediaStreamCenterClient.h"
 #include "wtf/Allocator.h"
+#include "wtf/OwnPtr.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/text/WTFString.h"
-#include <memory>
 
 namespace blink {
 
 class AudioSourceProvider;
 class MediaStreamComponent;
 class MediaStreamDescriptor;
 class WebMediaStream;
 class WebMediaStreamCenter;
 class WebMediaStreamTrack;
 
 class PLATFORM_EXPORT MediaStreamCenter final : public WebMediaStreamCenterClient {
     USING_FAST_MALLOC(MediaStreamCenter);
     WTF_MAKE_NONCOPYABLE(MediaStreamCenter);
 public:
     ~MediaStreamCenter() override;
 
     static MediaStreamCenter& instance();
 
     void didCreateMediaStreamTrack(MediaStreamComponent*);
     void didSetMediaStreamTrackEnabled(MediaStreamComponent*);
     bool didStopMediaStreamTrack(MediaStreamComponent*);
-    std::unique_ptr<AudioSourceProvider> createWebAudioSourceFromMediaStreamTrack(MediaStreamComponent*);
+    PassOwnPtr<AudioSourceProvider> createWebAudioSourceFromMediaStreamTrack(MediaStreamComponent*);
 
     void didCreateMediaStream(MediaStreamDescriptor*);
     void didCreateMediaStreamAndTracks(MediaStreamDescriptor*);
     bool didAddMediaStreamTrack(MediaStreamDescriptor*, MediaStreamComponent*);
     bool didRemoveMediaStreamTrack(MediaStreamDescriptor*, MediaStreamComponent*);
     void didStopLocalMediaStream(MediaStreamDescriptor*);
 
     // blink::WebMediaStreamCenterClient
     void stopLocalMediaStream(const WebMediaStream&) override;
 
 private:
     MediaStreamCenter();
 
-    std::unique_ptr<WebMediaStreamCenter> m_private;
+    OwnPtr<WebMediaStreamCenter> m_private;
 };
 
 } // namespace blink
 
 #endif // MediaStreamCenter_h