Oilpan: Prepare to move EventDispatchMediator to Oilpan heap.

Source/core/events/KeyboardEvent.cpp

Index: Source/core/events/KeyboardEvent.cpp
diff --git a/Source/core/events/KeyboardEvent.cpp b/Source/core/events/KeyboardEvent.cpp
index 1a18c41664a4db6bec3f80eee23a14b9ccdaafaf..a529f4909776a5bdc4b9a22549d954a0116ba562 100644
--- a/Source/core/events/KeyboardEvent.cpp
+++ b/Source/core/events/KeyboardEvent.cpp
@@ -221,9 +221,9 @@ void KeyboardEvent::trace(Visitor* visitor)
     UIEventWithKeyState::trace(visitor);
 }
 
-PassRefPtr<KeyboardEventDispatchMediator> KeyboardEventDispatchMediator::create(PassRefPtrWillBeRawPtr<KeyboardEvent> event)
+PassRefPtrWillBeRawPtr<KeyboardEventDispatchMediator> KeyboardEventDispatchMediator::create(PassRefPtrWillBeRawPtr<KeyboardEvent> event)
 {
-    return adoptRef(new KeyboardEventDispatchMediator(event));
+    return adoptRefWillBeNoop(new KeyboardEventDispatchMediator(event));
 }
 
 KeyboardEventDispatchMediator::KeyboardEventDispatchMediator(PassRefPtrWillBeRawPtr<KeyboardEvent> event)