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

Source/core/events/EventQueue.h

 /*
  * Copyright (C) 2010 Google Inc. All Rights Reserved.
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  * modification, are permitted provided that the following conditions
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 #ifndef EventQueue_h
 #define EventQueue_h
 
+#include "heap/Handle.h"
 #include "wtf/HashMap.h"
 #include "wtf/HashSet.h"
 #include "wtf/PassOwnPtr.h"
 
 namespace WebCore {
 
 class Event;
 
 class EventQueue {
 public:
     virtual ~EventQueue() { }
-    virtual bool enqueueEvent(PassRefPtr<Event>) = 0;
+    virtual bool enqueueEvent(PassRefPtrWillBeRawPtr<Event>) = 0;
     virtual bool cancelEvent(Event*) = 0;
     // The accumulated and all the future events will be discarded, no events will be dispatched anymore.
     virtual void close() = 0;
 };
 
 }
 
 #endif // EventQueue_h