Use more references in ContainerNode code

Source/core/dom/Node.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 899 matching lines @@
         return false;
 
     for (; node; node = node->shadowHost()) {
         if (treeScope() == node->treeScope())
             return contains(node);
     }
 
     return false;
 }
 
-bool Node::containsIncludingHostElements(const Node* node) const
+bool Node::containsIncludingHostElements(const Node& node) const
 {
-    while (node) {
-        if (node == this)
+    const Node* current = &node;
+    do {
+        if (current == this)
             return true;
-        if (node->isDocumentFragment() && toDocumentFragment(node)->isTemplateContent())
-            node = static_cast<const TemplateContentDocumentFragment*>(node)->host();
+        if (current->isDocumentFragment() && toDocumentFragment(current)->isTemplateContent())
+            current = static_cast<const TemplateContentDocumentFragment*>(current)->host();
         else
-            node = node->parentOrShadowHostNode();
-    }
+            current = current->parentOrShadowHostNode();
+    } while (current);
     return false;
 }
 
 void Node::reattach(const AttachContext& context)
 {
     AttachContext reattachContext(context);
     reattachContext.performingReattach = true;
 
     // We only need to detach if the node has already been through attach().
     if (styleChangeType() < NeedsReattachStyleChange)
@@ skipping 1683 matching lines @@
         node->showTreeForThis();
 }
 
 void showNodePath(const WebCore::Node* node)
 {
     if (node)
         node->showNodePathForThis();
 }
 
 #endif