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

Source/core/html/HTMLAnchorElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Simon Hausmann <hausmann@kde.org>
  * Copyright (C) 2003, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * 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
@@ skipping 693 matching lines @@
     if (capturedMouseDown) {
         double mouseDownDuration = convertDOMTimeStampToSeconds(event->timeStamp() - m_mouseDownTimestamp);
 
         HistogramSupport::histogramCustomCounts("MouseEventPrefetch.MouseDownDuration_Click", mouseDownDuration * 1000, 0, 10000, 100);
     }
 
     m_mouseOverTimestamp = 0;
     m_mouseDownTimestamp = 0;
 }
 
+void HTMLAnchorElement::acceptHeapVisitor(Visitor* visitor) const
+{
+    HTMLElement::acceptHeapVisitor(visitor);
 }
+
+}