Add [WillBeGarbageCollected] to Event.idl

Source/core/css/CSSFontFaceLoadEvent.h

Index: Source/core/css/CSSFontFaceLoadEvent.h
diff --git a/Source/core/css/CSSFontFaceLoadEvent.h b/Source/core/css/CSSFontFaceLoadEvent.h
index 3f14434f404055e55e8913dfa3309713d2ddc518..41ad45783416724686fbed59f7dc3e540f2e313a 100644
--- a/Source/core/css/CSSFontFaceLoadEvent.h
+++ b/Source/core/css/CSSFontFaceLoadEvent.h
@@ -45,19 +45,19 @@ struct CSSFontFaceLoadEventInit : public EventInit {
 
 class CSSFontFaceLoadEvent FINAL : public Event {
 public:
-    static PassRefPtr<CSSFontFaceLoadEvent> create()
+    static PassRefPtrWillBeRawPtr<CSSFontFaceLoadEvent> create()
     {
-        return adoptRef<CSSFontFaceLoadEvent>(new CSSFontFaceLoadEvent());
+        return adoptRefWillBeRefCountedGarbageCollected(new CSSFontFaceLoadEvent());
     }
 
-    static PassRefPtr<CSSFontFaceLoadEvent> create(const AtomicString& type, const CSSFontFaceLoadEventInit& initializer)
+    static PassRefPtrWillBeRawPtr<CSSFontFaceLoadEvent> create(const AtomicString& type, const CSSFontFaceLoadEventInit& initializer)
     {
-        return adoptRef<CSSFontFaceLoadEvent>(new CSSFontFaceLoadEvent(type, initializer));
+        return adoptRefWillBeRefCountedGarbageCollected(new CSSFontFaceLoadEvent(type, initializer));
     }
 
     static PassRefPtr<CSSFontFaceLoadEvent> createForFontFaces(const AtomicString& type, const FontFaceArray& fontfaces = FontFaceArray())
     {
-        return adoptRef<CSSFontFaceLoadEvent>(new CSSFontFaceLoadEvent(type, fontfaces));
+        return adoptRefWillBeRefCountedGarbageCollected(new CSSFontFaceLoadEvent(type, fontfaces));
     }
 
     virtual ~CSSFontFaceLoadEvent();