Support for latest WebIDL for indexed property getters.

Source/core/plugins/DOMPlugin.idl

 /*
     Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
     Copyright (C) 2008 Apple Inc. All rights reserved.
 
     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.
 */
 
 [
-    IndexedGetter,
     InterfaceName=Plugin
 ] interface DOMPlugin {
     readonly attribute DOMString name;
     readonly attribute DOMString filename;
     readonly attribute DOMString description;
     readonly attribute unsigned long length;
-    DOMMimeType item([Default=Undefined] optional unsigned long index);
+    getter DOMMimeType item([Default=Undefined] optional unsigned long index);
     getter DOMMimeType namedItem([Default=Undefined] optional DOMString name);
 };