Use stricter typing for HTMLCollection named getter

Source/core/html/HTMLFormControlsCollection.idl

Index: Source/core/html/HTMLFormControlsCollection.idl
diff --git a/Source/core/html/HTMLFormControlsCollection.idl b/Source/core/html/HTMLFormControlsCollection.idl
index ea83e03790ccdd87fd13c9988b1bf55198b76473..aeb9a1ec229328c71928a9775eefea16a3862739 100644
--- a/Source/core/html/HTMLFormControlsCollection.idl
+++ b/Source/core/html/HTMLFormControlsCollection.idl
@@ -23,6 +23,6 @@
     SetWrapperReferenceFrom=ownerNode,
 ] interface HTMLFormControlsCollection : HTMLCollection {
     [ImplementedAs=item] getter Node (unsigned long index);
-    [Custom] Node namedItem([Default=Undefined] optional DOMString name);
-    [ImplementedAs=namedGetter, NotEnumerable] getter (RadioNodeList or Node) (DOMString name);
+    [Custom] Element namedItem([Default=Undefined] optional DOMString name);
+    [ImplementedAs=namedGetter, NotEnumerable] getter (RadioNodeList or Element) (DOMString name);
 };