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

Source/core/svg/animation/SMILTimeContainer.cpp

 /*
  * Copyright (C) 2008 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 210 matching lines @@
 void SMILTimeContainer::timerFired(Timer<SMILTimeContainer>*)
 {
     ASSERT(m_beginTime);
     ASSERT(!m_pauseTime);
     updateAnimations(elapsed());
 }
 
 void SMILTimeContainer::updateDocumentOrderIndexes()
 {
     unsigned timingElementCount = 0;
-    for (Element* element = m_ownerSVGElement; element; element = ElementTraversal::next(element, m_ownerSVGElement)) {
+    for (Element* element = m_ownerSVGElement; element; element = ElementTraversal::next(*element, m_ownerSVGElement)) {
         if (SVGSMILElement::isSMILElement(element))
             toSVGSMILElement(element)->setDocumentOrderIndex(timingElementCount++);
     }
     m_documentOrderIndexesDirty = false;
 }
 
 struct PriorityCompare {
     PriorityCompare(SMILTime elapsed) : m_elapsed(elapsed) {}
     bool operator()(SVGSMILElement* a, SVGSMILElement* b)
     {
@@ skipping 89 matching lines @@
         animationsToApply[i]->applyResultsToTarget();
 
 #ifndef NDEBUG
     m_preventScheduledAnimationsChanges = false;
 #endif
 
     startTimer(earliestFireTime, animationFrameDelay);
 }
 
 }