[oilpan] Remove a couple of Persistents that are no longer needed.

Source/core/html/HTMLViewSourceDocument.cpp

 /*
  * Copyright (C) 2006, 2008, 2009, 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 302 matching lines @@
     anchor->setAttribute(targetAttr, "_blank");
     anchor->setAttribute(hrefAttr, url);
     m_current->parserAppendChild(anchor);
     anchor->attach();
     return anchor;
 }
 
 void HTMLViewSourceDocument::accept(Visitor* visitor) const
 {
     visitor->visit(m_current);
+    visitor->visit(m_tbody);
+    visitor->visit(m_td);
     HTMLDocument::accept(visitor);
 }
 
 }