Have HTMLFormElement's named getter return a RadioNodeList.

Source/core/dom/Node.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 1334 matching lines @@
 PassRefPtr<NodeList> Node::getElementsByName(const String& elementName)
 {
     return ensureRareData().ensureNodeLists().addCacheWithAtomicName<NameNodeList>(this, NameNodeListType, elementName);
 }
 
 PassRefPtr<NodeList> Node::getElementsByClassName(const String& classNames)
 {
     return ensureRareData().ensureNodeLists().addCacheWithName<ClassNodeList>(this, ClassNodeListType, classNames);
 }
 
-PassRefPtr<RadioNodeList> Node::radioNodeList(const AtomicString& name)
+PassRefPtr<RadioNodeList> Node::radioNodeList(const AtomicString& name, bool onlyMatchImgElements)
 {
     ASSERT(hasTagName(formTag) || hasTagName(fieldsetTag));
+    if (onlyMatchImgElements)
+        return static_pointer_cast<RadioNodeList>(ensureRareData().ensureNodeLists().addCacheWithAtomicName<RadioImgNodeList>(this, RadioNodeListType, name));
+
     return ensureRareData().ensureNodeLists().addCacheWithAtomicName<RadioNodeList>(this, RadioNodeListType, name);
 }
 
 PassRefPtr<Element> Node::querySelector(const AtomicString& selectors, ExceptionState& exceptionState)
 {
     if (selectors.isEmpty()) {
         exceptionState.throwDOMException(SyntaxError,  "The provided selector is empty.");
         return 0;
     }
 
@@ skipping 1369 matching lines @@
         node->showTreeForThis();
 }
 
 void showNodePath(const WebCore::Node* node)
 {
     if (node)
         node->showNodePathForThis();
 }
 
 #endif