Add [WillBeGarbageCollected] to Event.idl

Source/core/html/track/TrackEvent.h

 /*
  * Copyright (C) 2011 Apple 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 23 matching lines @@
 struct TrackEventInit : public EventInit {
     TrackEventInit();
 
     RefPtr<TrackBase> track;
 };
 
 class TrackEvent FINAL : public Event {
 public:
     virtual ~TrackEvent();
 
-    static PassRefPtr<TrackEvent> create()
+    static PassRefPtrWillBeRawPtr<TrackEvent> create()
     {
-        return adoptRef(new TrackEvent);
+        return adoptRefCountedWillBeRefCountedGarbageCollected(new TrackEvent);
     }
 
-    static PassRefPtr<TrackEvent> create(const AtomicString& type, const TrackEventInit& initializer)
+    static PassRefPtrWillBeRawPtr<TrackEvent> create(const AtomicString& type, const TrackEventInit& initializer)
     {
-        return adoptRef(new TrackEvent(type, initializer));
+        return adoptRefCountedWillBeRefCountedGarbageCollected(new TrackEvent(type, initializer));
     }
 
     virtual const AtomicString& interfaceName() const OVERRIDE;
 
     TrackBase* track() const { return m_track.get(); }
 
     virtual void trace(Visitor*) OVERRIDE;
 
 private:
     TrackEvent();
     TrackEvent(const AtomicString& type, const TrackEventInit& initializer);
 
     RefPtr<TrackBase> m_track;
 };
 
 } // namespace WebCore
 
 #endif