Add [WillBeGarbageCollected] to Event.idl

Source/modules/serviceworkers/InstallEvent.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 23 matching lines @@
 #include "bindings/v8/ScriptPromise.h"
 #include "modules/serviceworkers/InstallPhaseEvent.h"
 #include "wtf/Forward.h"
 
 namespace WebCore {
 
 class ExecutionContext;
 
 class InstallEvent FINAL : public InstallPhaseEvent {
 public:
-    static PassRefPtr<InstallEvent> create();
-    static PassRefPtr<InstallEvent> create(const AtomicString& type, const EventInit&, PassRefPtr<WaitUntilObserver>);
+    static PassRefPtrWillBeRawPtr<InstallEvent> create();
+    static PassRefPtrWillBeRawPtr<InstallEvent> create(const AtomicString& type, const EventInit&, PassRefPtr<WaitUntilObserver>);
     virtual ~InstallEvent() { }
 
     void replace();
 
     ScriptPromise reloadAll(ExecutionContext*);
 
     virtual const AtomicString& interfaceName() const OVERRIDE;
 
     virtual void trace(Visitor*) OVERRIDE;
 
 private:
     InstallEvent();
     InstallEvent(const AtomicString& type, const EventInit&, PassRefPtr<WaitUntilObserver>);
 };
 
 } // namespace WebCore
 
 #endif // InstallEvent_h