Have HTMLFormElement's named getter return a RadioNodeList.

Source/core/html/RadioNodeList.h

Index: Source/core/html/RadioNodeList.h
diff --git a/Source/core/html/RadioNodeList.h b/Source/core/html/RadioNodeList.h
index b735b0c337725375cb1987026805aa19baa527a4..eb120d6548ac2c95b73e07dc3bef30b12faf5d3c 100644
--- a/Source/core/html/RadioNodeList.h
+++ b/Source/core/html/RadioNodeList.h
@@ -32,7 +32,7 @@
 
 namespace WebCore {
 
-class RadioNodeList FINAL : public LiveNodeList {
+class RadioNodeList : public LiveNodeList {
 public:
     static PassRefPtr<RadioNodeList> create(Node* ownerNode, CollectionType type, const AtomicString& name)
     {
@@ -42,11 +42,13 @@ public:
 
     virtual ~RadioNodeList();
 
-    String value() const;
-    void setValue(const String&);
+    virtual String value() const;
+    virtual void setValue(const String&);
 
-private:
+protected:
     RadioNodeList(Node*, const AtomicString& name);
+
+private:
     bool checkElementMatchesRadioNodeListFilter(Element*) const;
 
     virtual bool nodeMatches(Element*) const OVERRIDE;
@@ -54,7 +56,27 @@ private:
     AtomicString m_name;
 };
 
-} // namepsace
+// A specialized version of RadioNodeList, limited to <img> elements.
+class RadioImgNodeList FINAL : public RadioNodeList {
+public:

[esprehn, 2013/12/19 11:02:48]

I'd rather you just added a bool to the RadioNodeList that switches it between
<img> only mode and regular mode. Then you can change the ASSERT() in the create
to (type == RadioNodeListType || type == RadioImgNodeListtype).

[sof, 2013/12/19 12:15:05]

Done.

+    static PassRefPtr<RadioImgNodeList> create(Node* ownerNode, CollectionType type, const AtomicString& name)
+    {
+        ASSERT_UNUSED(type, type == RadioNodeListType);
+        return adoptRef(new RadioImgNodeList(ownerNode, name));
+    }
+
+    virtual String value() const OVERRIDE { return String(); }
+    virtual void setValue(const String&) OVERRIDE { }
+
+private:
+    RadioImgNodeList(Node*, const AtomicString& name);
+
+    virtual bool nodeMatches(Element*) const OVERRIDE;
+
+    AtomicString m_name;
+};
+
+} // namespace
 
 #endif