Make sure the rootNode of a LiveNodeListBase is always a ContainerNode

Source/core/html/RadioNodeList.h

 /*
  * Copyright (c) 2012 Motorola Mobility, Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 16 matching lines @@
 #define RadioNodeList_h
 
 #include "core/dom/LiveNodeList.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/text/AtomicString.h"
 
 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));
     }
 
     virtual ~RadioNodeList();
 
     String value() const;
     void setValue(const String&);
 
 private:
-    RadioNodeList(Node*, const AtomicString& name, CollectionType);
+    RadioNodeList(ContainerNode*, const AtomicString& name, CollectionType);
 
     bool checkElementMatchesRadioNodeListFilter(const Element&) const;
 
     virtual bool nodeMatches(const Element&) const OVERRIDE;
 
     AtomicString m_name;
     const bool m_onlyMatchImgElements;
 };
 
 } // namespace
 
 #endif