Have HTMLFormElement's named getter return a RadioNodeList.

LayoutTests/fast/forms/form-radio-node-list-expected.txt

Index: LayoutTests/fast/forms/form-radio-node-list-expected.txt
diff --git a/LayoutTests/fast/forms/form-radio-node-list-expected.txt b/LayoutTests/fast/forms/form-radio-node-list-expected.txt
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+Test RadioNodeLists returned by the HTMLFormElement named-getter.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+PASS form1.elements.length is 10
+Check that only 'listed elements' are included in the list, if any.
+PASS radioNodeList.length is 10
+PASS radioNodeList[0] instanceof HTMLButtonElement is true
+PASS radioNodeList[1] instanceof HTMLFieldSetElement is true
+PASS radioNodeList[2] instanceof HTMLInputElement is true
+PASS radioNodeList[2].type is "hidden"
+PASS radioNodeList[3] instanceof HTMLInputElement is true
+PASS radioNodeList[3].type is "text"
+PASS radioNodeList[4] instanceof HTMLInputElement is true
+PASS radioNodeList[4].type is "radio"
+PASS radioNodeList[5] instanceof HTMLKeygenElement is true
+PASS radioNodeList[6] instanceof HTMLOutputElement is true
+PASS radioNodeList[7] instanceof HTMLObjectElement is true
+PASS radioNodeList[8] instanceof HTMLSelectElement is true
+PASS radioNodeList[9] instanceof HTMLTextAreaElement is true
+PASS successfullyParsed is true
+
+TEST COMPLETE
+ 
+            
+