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

Source/core/accessibility/AXObject.cpp

 /*
  * Copyright (C) 2008, 2009, 2011 Apple 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 508 matching lines @@
 }
 
 AXObject* AXObject::firstAccessibleObjectFromNode(const Node* node)
 {
     if (!node)
         return 0;
 
     AXObjectCache* cache = node->document().axObjectCache();
     AXObject* accessibleObject = cache->getOrCreate(node->renderer());
     while (accessibleObject && accessibleObject->accessibilityIsIgnored()) {
-        node = NodeTraversal::next(node);
+        node = NodeTraversal::next(*node);
 
         while (node && !node->renderer())
             node = NodeTraversal::nextSkippingChildren(node);
 
         if (!node)
             return 0;
 
         accessibleObject = cache->getOrCreate(node->renderer());
     }
 
@@ skipping 357 matching lines @@
         return ToggleButtonRole;
     if (ariaHasPopup())
         return PopUpButtonRole;
     // We don't contemplate RadioButtonRole, as it depends on the input
     // type.
 
     return ButtonRole;
 }
 
 } // namespace WebCore