Oilpan: Remove guardRef and guardDeref from TreeScope.

Source/core/dom/Element.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 160 matching lines @@
 
     if (hasActiveAnimations())
         activeAnimations()->dispose();
 
     if (isCustomElement())
         CustomElement::wasDestroyed(this);
 
     if (hasSyntheticAttrChildNodes())
         detachAllAttrNodesFromElement();
 
+#if !ENABLE(OILPAN)
+    // With Oilpan, either the Element has been removed from the Document
+    // or the Document is dead as well. If the Element has been removed from
+    // the Document the element has already been removed from the pending
+    // resources. If the document is also dead, there is no need to remove
+    // the element from the pending resources.
     if (hasPendingResources()) {
         document().accessSVGExtensions().removeElementFromPendingResources(this);
         ASSERT(!hasPendingResources());
     }
+#endif
 }
 
 inline ElementRareData* Element::elementRareData() const
 {
     ASSERT(hasRareData());
     return static_cast<ElementRareData*>(rareData());
 }
 
 inline ElementRareData& Element::ensureElementRareData()
 {
@@ skipping 3060 matching lines @@
         || isHTMLObjectElement(*this)
         || isHTMLAppletElement(*this)
         || isHTMLCanvasElement(*this))
         return false;
     if (FullscreenElementStack::isActiveFullScreenElement(this))
         return false;
     return true;
 }
 
 } // namespace WebCore