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

Source/core/svg/SVGElementRareData.h

 /*
  * Copyright (C) Research In Motion Limited 2010. 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 46 matching lines @@
         DEFINE_STATIC_LOCAL(SVGElementRareDataMap, rareDataMap, ());
         return rareDataMap;
 #endif
     }
 
     static SVGElementRareData* rareDataFromMap(const SVGElement* element)
     {
         return rareDataMap().get(element);
     }
 
-    HashSet<SVGElement*>& elementInstances() { return m_elementInstances; }
-    const HashSet<SVGElement*>& elementInstances() const { return m_elementInstances; }
+    WillBeHeapHashSet<RawPtrWillBeWeakMember<SVGElement> >& elementInstances() { return m_elementInstances; }
+    const WillBeHeapHashSet<RawPtrWillBeWeakMember<SVGElement> >& elementInstances() const { return m_elementInstances; }
 
     bool instanceUpdatesBlocked() const { return m_instancesUpdatesBlocked; }
     void setInstanceUpdatesBlocked(bool value) { m_instancesUpdatesBlocked = value; }
 
     SVGCursorElement* cursorElement() const { return m_cursorElement; }
     void setCursorElement(SVGCursorElement* cursorElement) { m_cursorElement = cursorElement; }
 
     SVGElement* correspondingElement() { return m_correspondingElement; }
     void setCorrespondingElement(SVGElement* correspondingElement) { m_correspondingElement = correspondingElement; }
 
@@ skipping 22 matching lines @@
         return m_overrideComputedStyle.get();
     }
 
     bool useOverrideComputedStyle() const { return m_useOverrideComputedStyle; }
     void setUseOverrideComputedStyle(bool value) { m_useOverrideComputedStyle = value; }
     void setNeedsOverrideComputedStyleUpdate() { m_needsOverrideComputedStyleUpdate = true; }
 
     void trace(Visitor* visitor)
     {
         visitor->trace(m_animatedSMILStyleProperties);
+        visitor->trace(m_elementInstances);
         visitor->registerWeakMembers<SVGElementRareData, &SVGElementRareData::processWeakMembers>(this);
     }
 
     void processWeakMembers(Visitor* visitor)
     {
 #if ENABLE(OILPAN)
         if (!visitor->isAlive(m_owner)) {
             // If the owning SVGElement is dead this raraData element will be collected ASAP.
             // The owning SVGElement will also be automatically removed from the SVGCursorElement's
             // HashSet so no need to call out and clear anything.
@@ skipping 17 matching lines @@
             }
             m_cursorImageValue = nullptr;
         }
         ASSERT(!m_cursorElement || visitor->isAlive(m_cursorElement));
         ASSERT(!m_cursorImageValue || visitor->isAlive(m_cursorImageValue));
 #endif
     }
 
 private:
     RawPtrWillBeWeakMember<SVGElement> m_owner;
-    HashSet<SVGElement*> m_elementInstances;
+    WillBeHeapHashSet<RawPtrWillBeWeakMember<SVGElement> > m_elementInstances;
     RawPtrWillBeWeakMember<SVGCursorElement> m_cursorElement;
     RawPtrWillBeWeakMember<CSSCursorImageValue> m_cursorImageValue;
     SVGElement* m_correspondingElement;
     bool m_instancesUpdatesBlocked : 1;
     bool m_useOverrideComputedStyle : 1;
     bool m_needsOverrideComputedStyleUpdate : 1;
     RefPtrWillBeMember<MutableStylePropertySet> m_animatedSMILStyleProperties;
     RefPtr<RenderStyle> m_overrideComputedStyle;
 };
 
 }
 
 #endif