Have HTMLFormElement's named getter return a RadioNodeList.

Source/core/html/RadioNodeList.cpp

Index: Source/core/html/RadioNodeList.cpp
diff --git a/Source/core/html/RadioNodeList.cpp b/Source/core/html/RadioNodeList.cpp
index f7cbfa982a2f55660b47bc3c18b2d3d583b25664..c112d8987c59993ddddc1fa7bbd0ffedca1041ab 100644
--- a/Source/core/html/RadioNodeList.cpp
+++ b/Source/core/html/RadioNodeList.cpp
@@ -107,5 +107,12 @@ bool RadioNodeList::nodeMatches(Element* testElement) const
     return checkElementMatchesRadioNodeListFilter(testElement);
 }
 
+RadioImgNodeList::RadioImgNodeList(Node* rootNode, const AtomicString& name) : RadioNodeList(rootNode, name) { }
+
+bool RadioImgNodeList::nodeMatches(Element* testElement) const
+{
+    return testElement->hasTagName(imgTag);
+}
+
 } // namspace