Add [WillBeGarbageCollected] to Event.idl

Source/modules/serviceworkers/InstallPhaseEvent.cpp

 /*
  * 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 18 matching lines @@
  */
 
 #include "config.h"
 #include "InstallPhaseEvent.h"
 
 #include "modules/serviceworkers/WaitUntilObserver.h"
 #include "platform/NotImplemented.h"
 
 namespace WebCore {
 
-PassRefPtr<InstallPhaseEvent> InstallPhaseEvent::create()
+PassRefPtrWillBeRawPtr<InstallPhaseEvent> InstallPhaseEvent::create()
 {
-    return adoptRef(new InstallPhaseEvent());
+    return adoptRefCountedWillBeRefCountedGarbageCollected(new InstallPhaseEvent());
 }
 
 InstallPhaseEvent::~InstallPhaseEvent()
 {
 }
 
 void InstallPhaseEvent::waitUntil(const ScriptValue& value)
 {
     m_observer->waitUntil(value);
 }
 
 InstallPhaseEvent::InstallPhaseEvent()
 {
 }
 
 InstallPhaseEvent::InstallPhaseEvent(const AtomicString& type, const EventInit& initializer, PassRefPtr<WaitUntilObserver> observer)
     : Event(type, initializer)
     , m_observer(observer)
 {
 }
 
 void InstallPhaseEvent::trace(Visitor* visitor)
 {
     Event::trace(visitor);
 }
 
 } // namespace WebCore