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

Source/core/svg/animation/SMILTimeContainer.h

Index: Source/core/svg/animation/SMILTimeContainer.h
diff --git a/Source/core/svg/animation/SMILTimeContainer.h b/Source/core/svg/animation/SMILTimeContainer.h
index 28fd8fb41d50b771b74183d0f9846f450d31788e..4d24650f617c2bb32508911b965be4e0b43fb6d0 100644
--- a/Source/core/svg/animation/SMILTimeContainer.h
+++ b/Source/core/svg/animation/SMILTimeContainer.h
@@ -46,7 +46,7 @@ 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&);
@@ -69,7 +69,7 @@ public:
     void setDocumentOrderIndexesDirty() { m_documentOrderIndexesDirty = true; }
 
 private:
-    SMILTimeContainer(SVGSVGElement* owner);
+    SMILTimeContainer(SVGSVGElement& owner);
 
     enum FrameSchedulingState {
         // No frame scheduled.
@@ -113,7 +113,7 @@ private:
     typedef HashMap<ElementAttributePair, OwnPtr<AnimationsVector> > GroupedAnimationsMap;
     GroupedAnimationsMap m_scheduledAnimations;
 
-    SVGSVGElement* m_ownerSVGElement;
+    SVGSVGElement& m_ownerSVGElement;
 
 #ifndef NDEBUG
     bool m_preventScheduledAnimationsChanges;