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 0d93e2ae4e969a3a25583a6ebd7c5f1fe2ebadb9..2212fb1eeb29d3086d9d5ec2e5e5de4215042990 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(const Element&) const OVERRIDE;