Update HTMLFormControlsCollection's named getter to behave according to spec

Source/core/html/HTMLFormControlsCollection.idl

 /*
  * Copyright (C) 2006, 2007, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
+ * Copyright (C) 2014 Samsung Electronics. 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.
  */
 
 [
     DependentLifetime,
     SetWrapperReferenceFrom=ownerNode,
 ] interface HTMLFormControlsCollection : HTMLCollection {
     [ImplementedAs=item] getter Node (unsigned long index);
-    [Custom] Element namedItem([Default=Undefined] optional DOMString name);
-    [ImplementedAs=namedGetter, NotEnumerable] getter (RadioNodeList or Element) (DOMString name);
+    [ImplementedAs=namedGetter] legacycaller getter (RadioNodeList or Element) namedItem(DOMString name); // shadows inherited namedItem()

[Nils Barth (inactive), 2014/02/07 01:40:43]

legacycaller is currently a nop;
do you want to omit this from this CL,
and instead add and implement in a followup?

[Inactive, 2014/02/07 01:52:38]

I know it is a noop but the parser doesn't mind it and it is present in the
spec. I figured it didn't hurt to add it. That said, I can remove it before
landing if you think it is not worth adding until it is implemented.

[Nils Barth (inactive), 2014/02/07 01:54:56]

I'd rather not include undocumented nops, since it can be misleading.
It's fine to include if you want to document it though,
preferably with a link to a bug, like:
// FIXME: legacycaller currently nop: http://crbug.com/???

How about this?

 };