IDL: Add [Custom=CallEpilogue] to eliminate CG special cases

Source/core/css/MediaQueryList.idl

 /*
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Library General Public
  *  License as published by the Free Software Foundation; either
  *  version 2 of the License, or (at your option) any later version.
  *
  *  This library is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 10 matching lines @@
 [
     ActiveDOMObject,
 ] interface MediaQueryList : EventTarget {
     readonly attribute DOMString media;
     readonly attribute boolean matches;
 
     // Even though this interface is now an event target, these functions
     // exist as aliases for addEventListener for backwards compatibility
     // with older versions of this interface. See the note at
     // http://dev.w3.org/csswg/cssom-view/#dom-mediaquerylist-removelistener
-    [ImplementedAs=addDeprecatedListener] void addListener(EventListener? listener);
-    [ImplementedAs=removeDeprecatedListener]void removeListener(EventListener? listener);
+    [ImplementedAs=addDeprecatedListener, Custom=CallEpilogue] void addListener(EventListener? listener);
+    [ImplementedAs=removeDeprecatedListener, Custom=CallEpilogue]void removeListener(EventListener? listener);
 
     attribute EventHandler onchange;
 };