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

Source/modules/mediastream/RTCVoidRequestImpl.h

Index: Source/modules/mediastream/RTCVoidRequestImpl.h
diff --git a/Source/modules/mediastream/RTCVoidRequestImpl.h b/Source/modules/mediastream/RTCVoidRequestImpl.h
index 74de5144675ea1f14860d1fba81d1e3e651126a1..1db483fe29441d0eee45608b7f1de40d5cc51dee 100644
--- a/Source/modules/mediastream/RTCVoidRequestImpl.h
+++ b/Source/modules/mediastream/RTCVoidRequestImpl.h
@@ -41,7 +41,7 @@ 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();
@@ -51,11 +51,11 @@ public:
     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;
 };