Revert "Add [WillBeGarbageCollected] to Event.idl"

Source/modules/serviceworkers/InstallPhaseEvent.h

 /*
  * Copyright (C) 2014 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 22 matching lines @@
 
 #include "bindings/v8/ScriptValue.h"
 #include "core/events/Event.h"
 
 namespace WebCore {
 
 class WaitUntilObserver;
 
 class InstallPhaseEvent : public Event {
 public:
-    static PassRefPtrWillBeRawPtr<InstallPhaseEvent> create();
+    static PassRefPtr<InstallPhaseEvent> create();
 
     virtual ~InstallPhaseEvent();
 
     void waitUntil(const ScriptValue&);
 
     virtual void trace(Visitor*) OVERRIDE;
 
 protected:
     InstallPhaseEvent();
     InstallPhaseEvent(const AtomicString& type, const EventInit&, PassRefPtr<WaitUntilObserver>);
 
     RefPtr<WaitUntilObserver> m_observer;
 };
 
 } // namespace WebCore
 
 #endif // InstallPhaseEvent_h