Oilpan: Remove guardRef and guardDeref from TreeScope.

Source/core/svg/SVGElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2008 Rob Buis <buis@kde.org>
  * Copyright (C) 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Alp Toker <alp@atoker.com>
  * Copyright (C) 2009 Cameron McCormack <cam@mcc.id.au>
  *
  * 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 95 matching lines @@
 
         // The rare data cleanup may have caused other SVG nodes to be deleted,
         // modifying the rare data map. Do not rely on the existing iterator.
         ASSERT(rareDataMap.contains(this));
         rareDataMap.remove(this);
         // Clear HasSVGRareData flag now so that we are in a consistent state when
         // calling rebuildAllElementReferencesForTarget() and
         // removeAllElementReferencesForTarget() below.
         clearHasSVGRareData();
     }
+#if !ENABLE(OILPAN)
+    // With Oilpan, either removedFrom has been called or the document is dead
+    // as well and there is no reason to clear out the extensions.
     document().accessSVGExtensions().rebuildAllElementReferencesForTarget(this);
     document().accessSVGExtensions().removeAllElementReferencesForTarget(this);
+#endif
 }
 
 void SVGElement::willRecalcStyle(StyleRecalcChange change)
 {
     if (!hasSVGRareData())
         return;
     // If the style changes because of a regular property change (not induced by SMIL animations themselves)
     // reset the "computed style without SMIL style properties", so the base value change gets reflected.
     if (change > NoChange || needsStyleRecalc())
         svgRareData()->setNeedsOverrideComputedStyleUpdate();
@@ skipping 981 matching lines @@
         animatableAttributes.add(SVGNames::zAttr);
     }
 
     if (name == classAttr)
         return true;
 
     return animatableAttributes.contains(name);
 }
 #endif
 }