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

Source/core/workers/WorkerEventQueue.h

 /*
  * Copyright (C) 2010 Google Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 29 matching lines @@
 class ExecutionContext;
 
 class WorkerEventQueue FINAL : public EventQueue {
     WTF_MAKE_FAST_ALLOCATED;
 public:
 
     static PassOwnPtr<WorkerEventQueue> create(ExecutionContext*);
     virtual ~WorkerEventQueue();
 
     // EventQueue
-    virtual bool enqueueEvent(PassRefPtr<Event>) OVERRIDE;
+    virtual bool enqueueEvent(PassRefPtrWillBeRawPtr<Event>) OVERRIDE;
     virtual bool cancelEvent(Event*) OVERRIDE;
     virtual void close() OVERRIDE;
 
 private:
     explicit WorkerEventQueue(ExecutionContext*);
     void removeEvent(Event*);
 
     ExecutionContext* m_executionContext;
     bool m_isClosed;
 
     class EventDispatcherTask;
-    typedef HashMap<RefPtr<Event>, EventDispatcherTask*> EventTaskMap;
+    typedef WillBePersistentHeapHashMap<RefPtrWillBeMember<Event>, EventDispatcherTask*> EventTaskMap;
     EventTaskMap m_eventTaskMap;
 };
 
 }
 
 #endif // WorkerEventQueue_h