Oilpan: Remove guardRef and guardDeref from TreeScope.

Source/core/svg/SVGStyleElement.cpp

 /*
  * Copyright (C) 2004, 2005 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2006 Apple Inc. All rights reserved.
  * 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
  * version 2 of the License, or (at your option) any later version.
@@ skipping 20 matching lines @@
 inline SVGStyleElement::SVGStyleElement(Document& document, bool createdByParser)
     : SVGElement(SVGNames::styleTag, document)
     , StyleElement(&document, createdByParser)
     , m_svgLoadEventTimer(this, &SVGElement::svgLoadEventTimerFired)
 {
     ScriptWrappable::init(this);
 }
 
 SVGStyleElement::~SVGStyleElement()
 {
+#if !ENABLE(OILPAN)
     StyleElement::clearDocumentData(document(), this);

[haraken, 2014/04/25 14:30:32]

I think we still need to call m_sheet->clearOwnerNode() since the StyleSheet can
outlive the SVGStyleElement.

[Mads Ager (chromium), 2014/04/28 09:45:21]

Yes, done. Added comment that the style sheet owner pointer should be strong and
that we can remove the clearing once it is.

+#endif
 }
 
 PassRefPtr<SVGStyleElement> SVGStyleElement::create(Document& document, bool createdByParser)
 {
     return adoptRef(new SVGStyleElement(document, createdByParser));
 }
 
 bool SVGStyleElement::disabled() const
 {
     if (!m_sheet)
@@ skipping 90 matching lines @@
         StyleElement::removedFromDocument(document(), this);
 }
 
 void SVGStyleElement::childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta)
 {
     SVGElement::childrenChanged(changedByParser, beforeChange, afterChange, childCountDelta);
     StyleElement::childrenChanged(this);
 }
 
 }