Add [WillBeGarbageCollected] to Event.idl

Source/core/events/OverflowEvent.h

Index: Source/core/events/OverflowEvent.h
diff --git a/Source/core/events/OverflowEvent.h b/Source/core/events/OverflowEvent.h
index 2a20a8d53a6aff13f6aa5c6c333964677862e74e..cedf0fcfa0748a68fc484f0355bf52c6ad9fa317 100644
--- a/Source/core/events/OverflowEvent.h
+++ b/Source/core/events/OverflowEvent.h
@@ -46,17 +46,17 @@ public:
         BOTH       = 2
     };
 
-    static PassRefPtr<OverflowEvent> create()
+    static PassRefPtrWillBeRawPtr<OverflowEvent> create()
     {
-        return adoptRef(new OverflowEvent);
+        return adoptRefWillBeRefCountedGarbageCollected(new OverflowEvent);
     }
-    static PassRefPtr<OverflowEvent> create(bool horizontalOverflowChanged, bool horizontalOverflow, bool verticalOverflowChanged, bool verticalOverflow)
+    static PassRefPtrWillBeRawPtr<OverflowEvent> create(bool horizontalOverflowChanged, bool horizontalOverflow, bool verticalOverflowChanged, bool verticalOverflow)
     {
-        return adoptRef(new OverflowEvent(horizontalOverflowChanged, horizontalOverflow, verticalOverflowChanged, verticalOverflow));
+        return adoptRefWillBeRefCountedGarbageCollected(new OverflowEvent(horizontalOverflowChanged, horizontalOverflow, verticalOverflowChanged, verticalOverflow));
     }
-    static PassRefPtr<OverflowEvent> create(const AtomicString& type, const OverflowEventInit& initializer)
+    static PassRefPtrWillBeRawPtr<OverflowEvent> create(const AtomicString& type, const OverflowEventInit& initializer)
     {
-        return adoptRef(new OverflowEvent(type, initializer));
+        return adoptRefWillBeRefCountedGarbageCollected(new OverflowEvent(type, initializer));
     }
 
     unsigned short orient() const { return m_orient; }