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

Source/core/html/HTMLKeygenElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2010 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.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 32 matching lines @@
 
 using namespace HTMLNames;
 
 class KeygenSelectElement : public HTMLSelectElement {
 public:
     static Result<KeygenSelectElement> create(Handle<Document> document)
     {
         return adoptTreeShared(new KeygenSelectElement(document));
     }
 
-    void acceptHeapVisitor(Visitor* visitor) const OVERRIDE
-    {
-        HTMLSelectElement::acceptHeapVisitor(visitor);
-    }
-
 protected:
     KeygenSelectElement(Handle<Document> document)
         : HTMLSelectElement(selectTag, document, 0)
     {
         DEFINE_STATIC_LOCAL(AtomicString, pseudoId, ("-webkit-keygen-select", AtomicString::ConstructFromLiteral));
         setPseudo(pseudoId);
     }
 
+    void acceptHeapVisitor(Visitor* visitor) const OVERRIDE
+    {
+        HTMLSelectElement::acceptHeapVisitor(visitor);
+    }
+
 private:
     virtual PassRefPtr<Element> cloneElementWithoutAttributesAndChildren()
     {
         return create(document()).passRefPtr();
     }
 };
 
 inline HTMLKeygenElement::HTMLKeygenElement(const QualifiedName& tagName, Handle<Document> document, HTMLFormElement* form)
     : HTMLFormControlElementWithState(tagName, document, form)
 {
@@ skipping 62 matching lines @@
     ShadowRoot* root = userAgentShadowRoot();
     return root ? toHTMLSelectElement(root->firstChild()) : nullptr;
 }
 
 void HTMLKeygenElement::acceptHeapVisitor(Visitor* visitor) const
 {
     HTMLFormControlElementWithState::acceptHeapVisitor(visitor);
 }
 
 } // namespace