Make sure the rootNode of a LiveNodeListBase is always a ContainerNode

Source/core/dom/NameNodeList.h

Index: Source/core/dom/NameNodeList.h
diff --git a/Source/core/dom/NameNodeList.h b/Source/core/dom/NameNodeList.h
index 5a595d8d9a369fe180fe1103f08c11555d40a3f4..320bc4c7aa02d56d1e1f0d99f8bcf79a1cb8590d 100644
--- a/Source/core/dom/NameNodeList.h
+++ b/Source/core/dom/NameNodeList.h
@@ -33,7 +33,7 @@ namespace WebCore {
 // NodeList which lists all Nodes in a Element with a given "name" attribute
 class NameNodeList FINAL : public LiveNodeList {
 public:
-    static PassRefPtr<NameNodeList> create(PassRefPtr<Node> rootNode, CollectionType type, const AtomicString& name)
+    static PassRefPtr<NameNodeList> create(PassRefPtr<ContainerNode> rootNode, CollectionType type, const AtomicString& name)
     {
         ASSERT_UNUSED(type, type == NameNodeListType);
         return adoptRef(new NameNodeList(rootNode, name));
@@ -42,7 +42,7 @@ public:
     virtual ~NameNodeList();
 
 private:
-    NameNodeList(PassRefPtr<Node> rootNode, const AtomicString& name);
+    NameNodeList(PassRefPtr<ContainerNode> rootNode, const AtomicString& name);
 
     virtual bool nodeMatches(Element*) const OVERRIDE;