Make sure the rootNode of a LiveNodeListBase is always a ContainerNode

Source/core/html/HTMLNameCollection.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2011, 2012 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 16 matching lines @@
 #include "core/dom/Element.h"
 #include "core/dom/ElementTraversal.h"
 #include "core/dom/NodeRareData.h"
 #include "core/html/HTMLEmbedElement.h"
 #include "core/html/HTMLObjectElement.h"
 
 namespace WebCore {
 
 using namespace HTMLNames;
 
-HTMLNameCollection::HTMLNameCollection(Node* document, CollectionType type, const AtomicString& name)
+HTMLNameCollection::HTMLNameCollection(ContainerNode* document, CollectionType type, const AtomicString& name)
     : HTMLCollection(document, type, OverridesItemAfter)
     , m_name(name)
 {
 }
 
 HTMLNameCollection::~HTMLNameCollection()
 {
     ASSERT(ownerNode());
     ASSERT(ownerNode()->isDocumentNode());
     ASSERT(type() == WindowNamedItems || type() == DocumentNamedItems);
@@ skipping 47 matching lines @@
             break;
         default:
             ASSERT_NOT_REACHED();
         }
     }
 
     return 0;
 }
 
 }