Oilpan: move RenderObjects off heap.

Source/core/rendering/svg/RenderSVGResourceFilter.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
  * Copyright (C) 2005 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
  * 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
@@ skipping 42 matching lines @@
 private:
     FilterData() : m_needToEndFilter(false) { }
 
 };
 
 class RenderSVGResourceFilter final : public RenderSVGResourceContainer {
 public:
     explicit RenderSVGResourceFilter(SVGFilterElement*);
 
     virtual ~RenderSVGResourceFilter();
-    virtual void trace(Visitor*) override;
     virtual void destroy() override;
 
     virtual bool isChildAllowed(RenderObject*, RenderStyle*) const override;
 
     virtual const char* renderName() const override { return "RenderSVGResourceFilter"; }
     virtual bool isOfType(RenderObjectType type) const override { return type == RenderObjectSVGResourceFilter || RenderSVGResourceContainer::isOfType(type); }
 
     virtual void removeAllClientsFromCache(bool markForInvalidation = true) override;
     virtual void removeClientFromCache(RenderObject*, bool markForInvalidation = true) override;
 
     // Returns the context that should be used to paint the filter contents, or
     // null if there is an error.
     GraphicsContext* prepareEffect(RenderObject*, GraphicsContext*);
     void finishEffect(RenderObject*, GraphicsContext*);
 
     FloatRect resourceBoundingBox(const RenderObject*);
 
     PassRefPtrWillBeRawPtr<SVGFilterBuilder> buildPrimitives(SVGFilter*);
 
     SVGUnitTypes::SVGUnitType filterUnits() const { return toSVGFilterElement(element())->filterUnits()->currentValue()->enumValue(); }
     SVGUnitTypes::SVGUnitType primitiveUnits() const { return toSVGFilterElement(element())->primitiveUnits()->currentValue()->enumValue(); }
 
     void primitiveAttributeChanged(RenderObject*, const QualifiedName&);
 
     static const RenderSVGResourceType s_resourceType = FilterResourceType;
     virtual RenderSVGResourceType resourceType() const override { return s_resourceType; }
 
 private:
-    typedef WillBeHeapHashMap<RawPtrWillBeMember<RenderObject>, OwnPtrWillBeMember<FilterData> > FilterMap;
+    typedef WillBePersistentHeapHashMap<RenderObject*, OwnPtrWillBeMember<FilterData>> FilterMap;
     FilterMap m_filter;
 };
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderSVGResourceFilter, isSVGResourceFilter());
 
 }
 
 #endif