Make sure the rootNode of a LiveNodeListBase is always a ContainerNode

Source/core/html/HTMLNameCollection.h

Index: Source/core/html/HTMLNameCollection.h
diff --git a/Source/core/html/HTMLNameCollection.h b/Source/core/html/HTMLNameCollection.h
index 7cfd08a6ebf64016ef8a7cb4260d1ec67d62c7b3..afb30195938ddf1f26242d19e8f2ab7cd8df279e 100644
--- a/Source/core/html/HTMLNameCollection.h
+++ b/Source/core/html/HTMLNameCollection.h
@@ -33,7 +33,7 @@ class Document;
 
 class HTMLNameCollection FINAL : public HTMLCollection {
 public:
-    static PassRefPtr<HTMLNameCollection> create(Node* document, CollectionType type, const AtomicString& name)
+    static PassRefPtr<HTMLNameCollection> create(ContainerNode* document, CollectionType type, const AtomicString& name)
     {
         return adoptRef(new HTMLNameCollection(document, type, name));
     }
@@ -41,7 +41,7 @@ public:
     ~HTMLNameCollection();
 
 private:
-    HTMLNameCollection(Node*, CollectionType, const AtomicString& name);
+    HTMLNameCollection(ContainerNode*, CollectionType, const AtomicString& name);
 
     virtual Element* virtualItemAfter(Element*) const OVERRIDE;