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

Source/core/html/HTMLLegendElement.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, 2010 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 41 matching lines @@
     // Check if there's a fieldset belonging to this legend.
     Element* fieldset = parentElement();
     while (fieldset && !fieldset->hasTagName(fieldsetTag))
         fieldset = fieldset->parentElement();
     if (!fieldset)
         return 0;
 
     // Find first form element inside the fieldset that is not a legend element.
     // FIXME: Should we consider tabindex?
     Element* element = fieldset;
-    while ((element = ElementTraversal::next(element, fieldset))) {
+    while ((element = ElementTraversal::next(*element, fieldset))) {
         if (element->isFormControlElement())
             return toHTMLFormControlElement(element);
     }
 
     return 0;
 }
 
 void HTMLLegendElement::focus(bool, FocusDirection direction)
 {
     if (isFocusable())
@@ skipping 16 matching lines @@
     // its parent, then the form attribute must return the same value as the
     // form attribute on that fieldset element. Otherwise, it must return null.
     ContainerNode* fieldset = parentNode();
     if (!fieldset || !fieldset->hasTagName(fieldsetTag))
         return 0;
 
     return toHTMLFieldSetElement(fieldset)->form();
 }
 
 } // namespace