Oilpan: Prepare to move EventDispatchMediator to Oilpan heap.

Source/core/events/EventDispatchMediator.cpp

Index: Source/core/events/EventDispatchMediator.cpp
diff --git a/Source/core/events/EventDispatchMediator.cpp b/Source/core/events/EventDispatchMediator.cpp
index 0ee176245b9a4e5896ae5361ede24e706ada09bd..f2b261a6c5040d4cf48da0362d0cd31a928a8129 100644
--- a/Source/core/events/EventDispatchMediator.cpp
+++ b/Source/core/events/EventDispatchMediator.cpp
@@ -36,9 +36,9 @@
 
 namespace WebCore {
 
-PassRefPtr<EventDispatchMediator> EventDispatchMediator::create(PassRefPtrWillBeRawPtr<Event> event)
+PassRefPtrWillBeRawPtr<EventDispatchMediator> EventDispatchMediator::create(PassRefPtrWillBeRawPtr<Event> event)
 {
-    return adoptRef(new EventDispatchMediator(event));
+    return adoptRefWillBeNoop(new EventDispatchMediator(event));
 }
 
 EventDispatchMediator::EventDispatchMediator(PassRefPtrWillBeRawPtr<Event> event)
@@ -46,6 +46,11 @@ EventDispatchMediator::EventDispatchMediator(PassRefPtrWillBeRawPtr<Event> event
 {
 }
 
+void EventDispatchMediator::trace(Visitor* visitor)
+{
+    visitor->trace(m_event);
+}
+
 bool EventDispatchMediator::dispatchEvent(EventDispatcher* dispatcher) const
 {
     ASSERT(m_event.get() == dispatcher->event());