Simplify Custom Element constructors to be functions, not wrappers

Source/core/dom/Document.idl

 /*
  * Copyright (C) 2006, 2007, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2006, 2007 Samuel Weinig <sam@webkit.org>
  *
  * 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
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
+callback CustomElementConstructor = Element ();
+
 [
     CustomToV8
 ] interface Document : Node {
 
     // DOM Level 1 Core
     readonly attribute DocumentType doctype;
     readonly attribute DOMImplementation implementation;
     readonly attribute Element documentElement;
 
     [DeliverCustomElementCallbacks, PerWorldBindings, ActivityLog=AccessForIsolatedWorlds, RaisesException] Element createElement([TreatNullAs=NullString,Default=Undefined] optional DOMString tagName);
@@ skipping 251 matching lines @@
 
     // ParentNode interface API
     readonly attribute HTMLCollection children;
     readonly attribute Element firstElementChild;
     readonly attribute Element lastElementChild;
     readonly attribute unsigned long childElementCount;
 
     readonly attribute HTMLScriptElement currentScript;
 };