Pass rootNode by reference when constructing node lists / collections

Source/core/dom/LiveNodeList.h

Index: Source/core/dom/LiveNodeList.h
diff --git a/Source/core/dom/LiveNodeList.h b/Source/core/dom/LiveNodeList.h
index 565092a267840813f8403c81a3edcd58d3f3630f..681fdc59617ebd39ddc338876fa5666eed84d38f 100644
--- a/Source/core/dom/LiveNodeList.h
+++ b/Source/core/dom/LiveNodeList.h
@@ -36,8 +36,8 @@ class Element;
 
 class LiveNodeList : public NodeList, public LiveNodeListBase {
 public:
-    LiveNodeList(PassRefPtr<ContainerNode> ownerNode, CollectionType collectionType, NodeListInvalidationType invalidationType, NodeListRootType rootType = NodeListIsRootedAtNode)
-        : LiveNodeListBase(ownerNode.get(), rootType, invalidationType,
+    LiveNodeList(ContainerNode& ownerNode, CollectionType collectionType, NodeListInvalidationType invalidationType, NodeListRootType rootType = NodeListIsRootedAtNode)
+        : LiveNodeListBase(ownerNode, rootType, invalidationType,
         collectionType)
     { }