Oilpan: Prepare to move EventDispatchMediator to Oilpan heap.

Source/core/events/GestureEvent.h

Index: Source/core/events/GestureEvent.h
diff --git a/Source/core/events/GestureEvent.h b/Source/core/events/GestureEvent.h
index 86f5a5d470a087bf5f2a2efbb1417d46bf1d871f..f92a87578c81364ee90b7d5bcfeba49cc78a1f8e 100644
--- a/Source/core/events/GestureEvent.h
+++ b/Source/core/events/GestureEvent.h
@@ -57,9 +57,9 @@ private:
 
 class GestureEventDispatchMediator FINAL : public EventDispatchMediator {
 public:
-    static PassRefPtr<GestureEventDispatchMediator> create(PassRefPtrWillBeRawPtr<GestureEvent> gestureEvent)
+    static PassRefPtrWillBeRawPtr<GestureEventDispatchMediator> create(PassRefPtrWillBeRawPtr<GestureEvent> gestureEvent)
     {
-        return adoptRef(new GestureEventDispatchMediator(gestureEvent));
+        return adoptRefWillBeNoop(new GestureEventDispatchMediator(gestureEvent));
     }
 
 private: