Decouple FileSystem and WebSQL callbacks from VoidCallback and it non-refcounted

Source/modules/mediastream/RTCVoidRequestImpl.h

 /*
  * Copyright (C) 2012 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 23 matching lines @@
 #include "core/dom/ActiveDOMObject.h"
 #include "platform/mediastream/RTCVoidRequest.h"
 
 namespace WebCore {
 
 class RTCErrorCallback;
 class VoidCallback;
 
 class RTCVoidRequestImpl : public RTCVoidRequest, public ActiveDOMObject {
 public:
-    static PassRefPtr<RTCVoidRequestImpl> create(ExecutionContext*, PassRefPtr<VoidCallback>, PassOwnPtr<RTCErrorCallback>);
+    static PassRefPtr<RTCVoidRequestImpl> create(ExecutionContext*, PassOwnPtr<VoidCallback>, PassOwnPtr<RTCErrorCallback>);
     virtual ~RTCVoidRequestImpl();
 
     virtual void requestSucceeded();
     virtual void requestFailed(const String& error);
 
     // ActiveDOMObject
     virtual void stop() OVERRIDE;
 
 private:
-    RTCVoidRequestImpl(ExecutionContext*, PassRefPtr<VoidCallback>, PassOwnPtr<RTCErrorCallback>);
+    RTCVoidRequestImpl(ExecutionContext*, PassOwnPtr<VoidCallback>, PassOwnPtr<RTCErrorCallback>);
 
     void clear();
 
-    RefPtr<VoidCallback> m_successCallback;
+    OwnPtr<VoidCallback> m_successCallback;
     OwnPtr<RTCErrorCallback> m_errorCallback;
 };
 
 } // namespace WebCore
 
 #endif // RTCVoidRequestImpl_h