Oilpan: Replace most of RefPtrs for Event objects with oilpan's transition types

Source/core/events/EventDispatcher.cpp

Index: Source/core/events/EventDispatcher.cpp
diff --git a/Source/core/events/EventDispatcher.cpp b/Source/core/events/EventDispatcher.cpp
index 91a351e9dedb9900064a06617e27d6beeeafb17d..b4619c9acb1c0b136aa386b30349123d4e470c30 100644
--- a/Source/core/events/EventDispatcher.cpp
+++ b/Source/core/events/EventDispatcher.cpp
@@ -49,7 +49,7 @@ bool EventDispatcher::dispatchEvent(Node* node, PassRefPtr<EventDispatchMediator
     return mediator->dispatchEvent(&dispatcher);
 }
 
-EventDispatcher::EventDispatcher(Node* node, PassRefPtr<Event> event)
+EventDispatcher::EventDispatcher(Node* node, PassRefPtrWillBeRawPtr<Event> event)
     : m_node(node)
     , m_event(event)
 #ifndef NDEBUG