Use new Traversal<SVG*Element> API more in SVG code

Source/core/svg/animation/SMILTimeContainer.h

 /*
  * 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 28 matching lines @@
 namespace WebCore {
 
 class AnimationClock;
 class Document;
 class SVGElement;
 class SVGSMILElement;
 class SVGSVGElement;
 
 class SMILTimeContainer : public RefCounted<SMILTimeContainer>  {
 public:
-    static PassRefPtr<SMILTimeContainer> create(SVGSVGElement* owner) { return adoptRef(new SMILTimeContainer(owner)); }
+    static PassRefPtr<SMILTimeContainer> create(SVGSVGElement& owner) { return adoptRef(new SMILTimeContainer(owner)); }
     ~SMILTimeContainer();
 
     void schedule(SVGSMILElement*, SVGElement*, const QualifiedName&);
     void unschedule(SVGSMILElement*, SVGElement*, const QualifiedName&);
     void notifyIntervalsChanged();
 
     SMILTime elapsed() const;
 
     bool isPaused() const;
     bool isStarted() const;
 
     void begin();
     void pause();
     void resume();
     void setElapsed(SMILTime);
 
     void serviceAnimations(double monotonicAnimationStartTime);
     bool hasAnimations() const;
 
     void setDocumentOrderIndexesDirty() { m_documentOrderIndexesDirty = true; }
 
 private:
-    SMILTimeContainer(SVGSVGElement* owner);
+    SMILTimeContainer(SVGSVGElement& owner);
 
     enum FrameSchedulingState {
         // No frame scheduled.
         Idle,
         // Scheduled a wakeup to update the animation values.
         SynchronizeAnimations,
         // Scheduled a animation frame for continuous update.
         AnimationFrame
     };
 
@@ skipping 23 matching lines @@
     bool m_documentOrderIndexesDirty;
 
     OwnPtr<AnimationClock> m_animationClock;
     Timer<SMILTimeContainer> m_wakeupTimer;
 
     typedef pair<SVGElement*, QualifiedName> ElementAttributePair;
     typedef Vector<SVGSMILElement*> AnimationsVector;
     typedef HashMap<ElementAttributePair, OwnPtr<AnimationsVector> > GroupedAnimationsMap;
     GroupedAnimationsMap m_scheduledAnimations;
 
-    SVGSVGElement* m_ownerSVGElement;
+    SVGSVGElement& m_ownerSVGElement;
 
 #ifndef NDEBUG
     bool m_preventScheduledAnimationsChanges;
 #endif
 };
 }
 
 #endif // SMILTimeContainer_h