[oilpan] The Node hierarchy should have correct accept method chains

Source/core/dom/PseudoElement.cpp

 /*
  * Copyright (C) 2012 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 107 matching lines @@
             continue;
 
         // The style for the RenderTextFragment for first letter is managed by an enclosing block, not by us.
         if (child->style()->styleType() == FIRST_LETTER)
             continue;
 
         child->setPseudoStyle(renderer->style());
     }
 }
 
+void PseudoElement::acceptHeapVisitor(Visitor* visitor) const
+{
+    Element::acceptHeapVisitor(visitor);
+}
+
 } // namespace