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

Source/core/html/TextDocument.cpp

 /*
  * Copyright (C) 2006, 2007, 2008 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 23 matching lines @@
 {
     setCompatibilityMode(QuirksMode);
     lockCompatibilityMode();
 }
 
 PassRefPtr<DocumentParser> TextDocument::createParser()
 {
     return TextDocumentParser::create(this);
 }
 
+void TextDocument::acceptHeapVisitor(Visitor* visitor) const
+{
+    HTMLDocument::acceptHeapVisitor(visitor);
 }
+
+}