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 b48d6e9dda04f05864993e292e0feca9db22c439..1535cb6d87c83395d1e34c3832f49be95b0fe499 100644
--- a/Source/modules/webaudio/OfflineAudioCompletionEvent.cpp
+++ b/Source/modules/webaudio/OfflineAudioCompletionEvent.cpp
@@ -30,14 +30,14 @@
 
 namespace WebCore {
 
-PassRefPtr<OfflineAudioCompletionEvent> OfflineAudioCompletionEvent::create()
+PassRefPtrWillBeRawPtr<OfflineAudioCompletionEvent> OfflineAudioCompletionEvent::create()
 {
-    return adoptRef(new OfflineAudioCompletionEvent);
+    return adoptRefWillBeRefCountedGarbageCollected(new OfflineAudioCompletionEvent);
 }
 
-PassRefPtr<OfflineAudioCompletionEvent> OfflineAudioCompletionEvent::create(PassRefPtr<AudioBuffer> renderedBuffer)
+PassRefPtrWillBeRawPtr<OfflineAudioCompletionEvent> OfflineAudioCompletionEvent::create(PassRefPtr<AudioBuffer> renderedBuffer)
 {
-    return adoptRef(new OfflineAudioCompletionEvent(renderedBuffer));
+    return adoptRefWillBeRefCountedGarbageCollected(new OfflineAudioCompletionEvent(renderedBuffer));
 }
 
 OfflineAudioCompletionEvent::OfflineAudioCompletionEvent()