Oilpan: Remove guardRef and guardDeref from TreeScope.

Source/core/dom/StyleElement.cpp

 /*
  * Copyright (C) 2006, 2007 Rob Buis
  * Copyright (C) 2008 Apple, Inc. 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
  * 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 34 matching lines @@
     , m_loading(false)
     , m_registeredAsCandidate(false)
     , m_startPosition(TextPosition::belowRangePosition())
 {
     if (createdByParser && document && document->scriptableDocumentParser() && !document->isInDocumentWrite())
         m_startPosition = document->scriptableDocumentParser()->textPosition();
 }
 
 StyleElement::~StyleElement()
 {
+#if !ENABLE(OILPAN)
     if (m_sheet)
         clearSheet();
+#endif
 }
 
 void StyleElement::processStyleSheet(Document& document, Element* element)
 {
     TRACE_EVENT0("webkit", "StyleElement::processStyleSheet");
     ASSERT(element);
     ASSERT(element->inDocument());
 
     m_registeredAsCandidate = true;
     document.styleEngine()->addStyleSheetCandidateNode(element, m_createdByParser);
@@ skipping 114 matching lines @@
     document.styleEngine()->removePendingSheet(m_sheet->ownerNode());
     return true;
 }
 
 void StyleElement::startLoadingDynamicSheet(Document& document)
 {
     document.styleEngine()->addPendingSheet();
 }
 
 }