Oilpan: cleanup based on review comments after removal of TreeShared.

Source/core/svg/SVGAnimateMotionElement.cpp

 /*
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2008 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 293 matching lines @@
         return;
 
     if (RenderObject* renderer = targetElement->renderer())
         RenderSVGResource::markForLayoutAndParentResourceInvalidation(renderer);
 
     AffineTransform* t = targetElement->supplementalTransform();
     if (!t)
         return;
 
     // ...except in case where we have additional instances in <use> trees.
-    const HashSet<SVGElement*>& instances = targetElement->instancesForElement();
-    const HashSet<SVGElement*>::const_iterator end = instances.end();
-    for (HashSet<SVGElement*>::const_iterator it = instances.begin(); it != end; ++it) {
+    const WillBeHeapHashSet<RawPtrWillBeWeakMember<SVGElement> >& instances = targetElement->instancesForElement();
+    const WillBeHeapHashSet<RawPtrWillBeWeakMember<SVGElement> >::const_iterator end = instances.end();
+    for (WillBeHeapHashSet<RawPtrWillBeWeakMember<SVGElement> >::const_iterator it = instances.begin(); it != end; ++it) {
         SVGElement* shadowTreeElement = *it;
         ASSERT(shadowTreeElement);
         AffineTransform* transform = shadowTreeElement->supplementalTransform();
         if (!transform)
             continue;
         transform->setMatrix(t->a(), t->b(), t->c(), t->d(), t->e(), t->f());
         if (RenderObject* renderer = shadowTreeElement->renderer()) {
             renderer->setNeedsTransformUpdate();
             RenderSVGResource::markForLayoutAndParentResourceInvalidation(renderer);
         }
@@ skipping 14 matching lines @@
 
 void SVGAnimateMotionElement::updateAnimationMode()
 {
     if (!m_animationPath.isEmpty())
         setAnimationMode(PathAnimation);
     else
         SVGAnimationElement::updateAnimationMode();
 }
 
 }