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 d0c2c80d000322361511a0c4e68bd9dcaabb3414..df7d7080a6dad309fe8034b9430e6751b700b039 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(const Element&) const;