prepare |SVGDocumentExtensions::m_relativeLengthSVGRoots| for oilpan

Source/core/svg/SVGDocumentExtensions.cpp

 /*
  * Copyright (C) 2006 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2007 Rob Buis <buis@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.
  *
@@ skipping 393 matching lines @@
     return m_relativeLengthSVGRoots.contains(svgRoot);
 }
 
 void SVGDocumentExtensions::invalidateSVGRootsWithRelativeLengthDescendents(SubtreeLayoutScope* scope)
 {
     ASSERT(!m_inRelativeLengthSVGRootsInvalidation);
 #if !ASSERT_DISABLED
     TemporaryChange<bool> inRelativeLengthSVGRootsChange(m_inRelativeLengthSVGRootsInvalidation, true);
 #endif
 
-    HashSet<SVGSVGElement*>::iterator end = m_relativeLengthSVGRoots.end();
-    for (HashSet<SVGSVGElement*>::iterator it = m_relativeLengthSVGRoots.begin(); it != end; ++it)
+    WillBeHeapHashSet<RawPtrWillBeMember<SVGSVGElement> >::iterator end = m_relativeLengthSVGRoots.end();
+    for (WillBeHeapHashSet<RawPtrWillBeMember<SVGSVGElement> >::iterator it = m_relativeLengthSVGRoots.begin(); it != end; ++it)
         (*it)->invalidateRelativeLengthClients(scope);
 }
 
 #if ENABLE(SVG_FONTS)
 void SVGDocumentExtensions::registerSVGFontFaceElement(SVGFontFaceElement* element)
 {
     m_svgFontFaceElements.add(element);
 }
 
 void SVGDocumentExtensions::unregisterSVGFontFaceElement(SVGFontFaceElement* element)
@@ skipping 50 matching lines @@
 {
     ASSERT(m_document);
     return rootElement(*m_document);
 }
 
 void SVGDocumentExtensions::trace(Visitor* visitor)
 {
     visitor->trace(m_timeContainers);
     visitor->trace(m_svgFontFaceElements);
     visitor->trace(m_pendingSVGFontFaceElementsForRemoval);
+    visitor->trace(m_relativeLengthSVGRoots);
 }
 
 }