Add [WillBeGarbageCollected] to Event.idl

Source/modules/mediastream/MediaStreamTrackEvent.cpp

Index: Source/modules/mediastream/MediaStreamTrackEvent.cpp
diff --git a/Source/modules/mediastream/MediaStreamTrackEvent.cpp b/Source/modules/mediastream/MediaStreamTrackEvent.cpp
index de78e19ecfd8c49784dbb3c4ae5c5d09ee43b48b..1f8753b9f74b3df8d66097a5f6cb9ba293f78928 100644
--- a/Source/modules/mediastream/MediaStreamTrackEvent.cpp
+++ b/Source/modules/mediastream/MediaStreamTrackEvent.cpp
@@ -29,14 +29,14 @@
 
 namespace WebCore {
 
-PassRefPtr<MediaStreamTrackEvent> MediaStreamTrackEvent::create()
+PassRefPtrWillBeRawPtr<MediaStreamTrackEvent> MediaStreamTrackEvent::create()
 {
-    return adoptRef(new MediaStreamTrackEvent);
+    return adoptRefWillBeRefCountedGarbageCollected(new MediaStreamTrackEvent);
 }
 
-PassRefPtr<MediaStreamTrackEvent> MediaStreamTrackEvent::create(const AtomicString& type, bool canBubble, bool cancelable, PassRefPtr<MediaStreamTrack> track)
+PassRefPtrWillBeRawPtr<MediaStreamTrackEvent> MediaStreamTrackEvent::create(const AtomicString& type, bool canBubble, bool cancelable, PassRefPtr<MediaStreamTrack> track)
 {
-    return adoptRef(new MediaStreamTrackEvent(type, canBubble, cancelable, track));
+    return adoptRefWillBeRefCountedGarbageCollected(new MediaStreamTrackEvent(type, canBubble, cancelable, track));
 }