Support union return type for anonymous named/indexed getter

Source/core/html/HTMLFormControlsCollection.h

Index: Source/core/html/HTMLFormControlsCollection.h
diff --git a/Source/core/html/HTMLFormControlsCollection.h b/Source/core/html/HTMLFormControlsCollection.h
index 022b0eb72484f1a239d1fccb599ab69b1b294edf..f806b788f59b654b62c52ad6dda9293e9119e8df 100644
--- a/Source/core/html/HTMLFormControlsCollection.h
+++ b/Source/core/html/HTMLFormControlsCollection.h
@@ -24,6 +24,8 @@
 #define HTMLFormControlsCollection_h
 
 #include "core/html/HTMLCollection.h"
+#include "core/html/RadioNodeList.h"
+#include "wtf/UnionType.h"
 
 namespace WebCore {
 
@@ -42,6 +44,7 @@ public:
     virtual ~HTMLFormControlsCollection();
 
     virtual Node* namedItem(const AtomicString& name) const;
+    WTF::UnionType2<RadioNodeList, Node> namedGetter(const AtomicString& name);
 
 private:
     HTMLFormControlsCollection(Node*);