Have ElementTraversal / NodeTraversal's next() methods take a reference

Source/core/html/HTMLOptionElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2004, 2005, 2006, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2011 Motorola Mobility, Inc.  All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 349 matching lines @@
 String HTMLOptionElement::collectOptionInnerText() const
 {
     StringBuilder text;
     for (Node* node = firstChild(); node; ) {
         if (node->isTextNode())
             text.append(node->nodeValue());
         // Text nodes inside script elements are not part of the option text.
         if (node->isElementNode() && toScriptLoaderIfPossible(toElement(node)))
             node = NodeTraversal::nextSkippingChildren(node, this);
         else
-            node = NodeTraversal::next(node, this);
+            node = NodeTraversal::next(*node, this);
     }
     return text.toString();
 }
 
 } // namespace WebCore