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

Source/core/events/EventTarget.h

Index: Source/core/events/EventTarget.h
diff --git a/Source/core/events/EventTarget.h b/Source/core/events/EventTarget.h
index c1bf895d476ccdb61ed82d4813e756a1f37781ca..95b00150b14fadd3a0d30cc5a1806d67200c06ad 100644
--- a/Source/core/events/EventTarget.h
+++ b/Source/core/events/EventTarget.h
@@ -34,6 +34,7 @@
 
 #include "core/events/EventListenerMap.h"
 #include "core/events/ThreadLocalEventNames.h"
+#include "heap/Handle.h"
 #include "wtf/Forward.h"
 
 namespace WebCore {
@@ -117,8 +118,8 @@ public:
     bool removeEventListener(const AtomicString& eventType) { return false; }
     virtual bool removeEventListener(const AtomicString& eventType, EventListener*, bool useCapture = false);
     virtual void removeAllEventListeners();
-    virtual bool dispatchEvent(PassRefPtr<Event>);
-    bool dispatchEvent(PassRefPtr<Event>, ExceptionState&); // DOM API
+    virtual bool dispatchEvent(PassRefPtrWillBeRawPtr<Event>);
+    bool dispatchEvent(PassRefPtrWillBeRawPtr<Event>, ExceptionState&); // DOM API
     virtual void uncaughtExceptionInEventHandler();
 
     // Used for legacy "onEvent" attribute APIs.