Add support for [PutForwards] IDL extended attribute

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,
@@ skipping 112 matching lines @@
     readonly attribute HTMLHeadElement head;
     readonly attribute HTMLCollection images;
     readonly attribute HTMLCollection applets;
     readonly attribute HTMLCollection links;
     readonly attribute HTMLCollection forms;
     readonly attribute HTMLCollection anchors;
     readonly attribute DOMString lastModified;
 
     [PerWorldBindings] NodeList getElementsByName([Default=Undefined] optional DOMString elementName);
 
-    [Custom, Replaceable, PerWorldBindings, ActivityLogging=AccessForIsolatedWorlds] readonly attribute Location location;
+    [PerWorldBindings, ActivityLogging=AccessForIsolatedWorlds, PutForwards=href] readonly attribute Location location;
 
     // IE extensions
     [MeasureAs=DocumentCharset, TreatReturnedNullStringAs=Undefined, TreatNullAs=NullString] attribute DOMString charset;
     [MeasureAs=DocumentCharset, TreatReturnedNullStringAs=Undefined] readonly attribute DOMString defaultCharset;
     [TreatReturnedNullStringAs=Undefined] readonly attribute DOMString readyState;
 
     Element            elementFromPoint([Default=Undefined] optional long x,
                                         [Default=Undefined] optional long y);
     Range              caretRangeFromPoint([Default=Undefined] optional long x,
                                            [Default=Undefined] optional long y);
@@ skipping 128 matching lines @@
     readonly attribute boolean webkitHidden;
 
     // Security Policy API: http://dvcs.w3.org/hg/content-security-policy/raw-file/tip/csp-specification.dev.html#script-interfaces
     [RuntimeEnabled=ExperimentalContentSecurityPolicyFeatures] readonly attribute SecurityPolicy securityPolicy;
 
     readonly attribute HTMLScriptElement currentScript;
 };
 
 Document implements ParentNode;