Make sure the rootNode of a LiveNodeListBase is always a ContainerNode

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 8a034a0df3ca3214c6ff791ce70d0b7580b2754b..0a8d2ef600bae99bb923b9b774b763316c989aa9 100644
--- a/Source/core/html/RadioNodeList.h
+++ b/Source/core/html/RadioNodeList.h
@@ -34,7 +34,7 @@ namespace WebCore {
 
 class RadioNodeList FINAL : public LiveNodeList {
 public:
-    static PassRefPtr<RadioNodeList> create(Node* ownerNode, CollectionType type, const AtomicString& name)
+    static PassRefPtr<RadioNodeList> create(ContainerNode* ownerNode, CollectionType type, const AtomicString& name)
     {
         ASSERT_UNUSED(type, type == RadioNodeListType || type == RadioImgNodeListType);
         return adoptRef(new RadioNodeList(ownerNode, name, type));
@@ -46,7 +46,7 @@ public:
     void setValue(const String&);
 
 private:
-    RadioNodeList(Node*, const AtomicString& name, CollectionType);
+    RadioNodeList(ContainerNode*, const AtomicString& name, CollectionType);
 
     bool checkElementMatchesRadioNodeListFilter(Element*) const;