Add [WillBeGarbageCollected] to Event.idl

Source/modules/encryptedmedia/MediaKeyNeededEvent.h

Index: Source/modules/encryptedmedia/MediaKeyNeededEvent.h
diff --git a/Source/modules/encryptedmedia/MediaKeyNeededEvent.h b/Source/modules/encryptedmedia/MediaKeyNeededEvent.h
index 545352da273b4b56ceffdaa5cbb615b9f613ee85..1421a078de2e50a80dddd27ab7d75c1cc14082aa 100644
--- a/Source/modules/encryptedmedia/MediaKeyNeededEvent.h
+++ b/Source/modules/encryptedmedia/MediaKeyNeededEvent.h
@@ -42,14 +42,14 @@ class MediaKeyNeededEvent FINAL : public Event {
 public:
     virtual ~MediaKeyNeededEvent();
 
-    static PassRefPtr<MediaKeyNeededEvent> create()
+    static PassRefPtrWillBeRawPtr<MediaKeyNeededEvent> create()
     {
-        return adoptRef(new MediaKeyNeededEvent);
+        return adoptRefWillBeRefCountedGarbageCollected(new MediaKeyNeededEvent);
     }
 
-    static PassRefPtr<MediaKeyNeededEvent> create(const AtomicString& type, const MediaKeyNeededEventInit& initializer)
+    static PassRefPtrWillBeRawPtr<MediaKeyNeededEvent> create(const AtomicString& type, const MediaKeyNeededEventInit& initializer)
     {
-        return adoptRef(new MediaKeyNeededEvent(type, initializer));
+        return adoptRefWillBeRefCountedGarbageCollected(new MediaKeyNeededEvent(type, initializer));
     }
 
     virtual const AtomicString& interfaceName() const OVERRIDE;