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 ac9078ad0869ea29757f1c509e27fc3f2c168301..082fa762d09ae225a3b41042b1dc5ead7a38b1cc 100644
--- a/Source/modules/mediastream/MediaStreamTrackEvent.cpp
+++ b/Source/modules/mediastream/MediaStreamTrackEvent.cpp
@@ -30,14 +30,14 @@
 
 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));
 }