prepare |SVGDocumentExtensions::m_relativeLengthSVGRoots| for oilpan

Source/core/svg/SVGDocumentExtensions.h

 /*
  * Copyright (C) 2006 Apple Inc. All rights reserved.
  * Copyright (C) 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  *
  * 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,
@@ skipping 92 matching lines @@
 #if ENABLE(SVG_FONTS)
     WillBeHeapHashSet<RawPtrWillBeMember<SVGFontFaceElement> > m_svgFontFaceElements;
     // SVGFontFaceElements that are pending and scheduled for removal.
     WillBeHeapHashSet<RefPtrWillBeMember<SVGFontFaceElement> > m_pendingSVGFontFaceElementsForRemoval;
 #endif
     HashMap<AtomicString, RenderSVGResourceContainer*> m_resources;
     HashMap<AtomicString, OwnPtr<SVGPendingElements> > m_pendingResources; // Resources that are pending.
     HashMap<AtomicString, OwnPtr<SVGPendingElements> > m_pendingResourcesForRemoval; // Resources that are pending and scheduled for removal.
     HashMap<SVGElement*, OwnPtr<HashSet<SVGElement*> > > m_elementDependencies;
     OwnPtr<SVGResourcesCache> m_resourcesCache;
-    HashSet<SVGSVGElement*> m_relativeLengthSVGRoots; // Root SVG elements with relative length descendants.
+    WillBeHeapHashSet<RawPtrWillBeMember<SVGSVGElement> > m_relativeLengthSVGRoots; // Root SVG elements with relative length descendants.
     FloatPoint m_translate;
 #if !ASSERT_DISABLED
     bool m_inRelativeLengthSVGRootsInvalidation;
 #endif
 
 public:
     // This HashMap contains a list of pending resources. Pending resources, are such
     // which are referenced by any object in the SVG document, but do NOT exist yet.
     // For instance, dynamically build gradients / patterns / clippers...
     void addPendingResource(const AtomicString& id, Element*);
@@ skipping 10 matching lines @@
     void markPendingResourcesForRemoval(const AtomicString&);
     Element* removeElementFromPendingResourcesForRemoval(const AtomicString&);
 
 private:
     PassOwnPtr<SVGPendingElements> removePendingResourceForRemoval(const AtomicString&);
 };
 
 }
 
 #endif