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

Source/core/accessibility/AXNodeObject.cpp

 /*
 * Copyright (C) 2012, Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 80 matching lines @@
 }
 
 String AXNodeObject::accessibilityDescriptionForElements(Vector<Element*> &elements) const
 {
     StringBuilder builder;
     unsigned size = elements.size();
     for (unsigned i = 0; i < size; ++i) {
         Element* idElement = elements[i];
 
         builder.append(accessibleNameForNode(idElement));
-        for (Node* n = idElement->firstChild(); n; n = NodeTraversal::next(n, idElement))
+        for (Node* n = idElement->firstChild(); n; n = NodeTraversal::next(*n, idElement))
             builder.append(accessibleNameForNode(n));
 
         if (i != size - 1)
             builder.append(' ');
     }
     return builder.toString();
 }
 
 void AXNodeObject::alterSliderValue(bool increase)
 {
@@ skipping 1692 matching lines @@
         useTextUnderElement = true;
 
     if (useTextUnderElement) {
         String text = textUnderElement();
         if (!text.isEmpty())
             textOrder.append(AccessibilityText(text, ChildrenText));
     }
 }
 
 } // namespace WebCore