Add [WillBeGarbageCollected] to Event.idl

Source/modules/webaudio/OfflineAudioCompletionEvent.cpp

Index: Source/modules/webaudio/OfflineAudioCompletionEvent.cpp
diff --git a/Source/modules/webaudio/OfflineAudioCompletionEvent.cpp b/Source/modules/webaudio/OfflineAudioCompletionEvent.cpp
index 19097a288af11eacab281cc9465a4d1144629b59..9355783a72b422bfe31694c7d781d38fa1f4789b 100644
--- a/Source/modules/webaudio/OfflineAudioCompletionEvent.cpp
+++ b/Source/modules/webaudio/OfflineAudioCompletionEvent.cpp
@@ -32,14 +32,14 @@
 
 namespace WebCore {
 
-PassRefPtr<OfflineAudioCompletionEvent> OfflineAudioCompletionEvent::create()
+PassRefPtrWillBeRawPtr<OfflineAudioCompletionEvent> OfflineAudioCompletionEvent::create()
 {
-    return adoptRef(new OfflineAudioCompletionEvent);
+    return adoptRefCountedWillBeRefCountedGarbageCollected(new OfflineAudioCompletionEvent);
 }
 
-PassRefPtr<OfflineAudioCompletionEvent> OfflineAudioCompletionEvent::create(PassRefPtr<AudioBuffer> renderedBuffer)
+PassRefPtrWillBeRawPtr<OfflineAudioCompletionEvent> OfflineAudioCompletionEvent::create(PassRefPtr<AudioBuffer> renderedBuffer)
 {
-    return adoptRef(new OfflineAudioCompletionEvent(renderedBuffer));
+    return adoptRefCountedWillBeRefCountedGarbageCollected(new OfflineAudioCompletionEvent(renderedBuffer));
 }
 
 OfflineAudioCompletionEvent::OfflineAudioCompletionEvent()