Remove form control related virtual methods from Element

Source/core/html/HTMLOptGroupElement.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, 2007, 2008, 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 40 matching lines @@
 {
     return fastHasAttribute(disabledAttr);
 }
 
 bool HTMLOptGroupElement::rendererIsFocusable() const
 {
     // Optgroup elements do not have a renderer so we check the renderStyle instead.
     return renderStyle() && renderStyle()->display() != NONE;
 }
 
-const AtomicString& HTMLOptGroupElement::formControlType() const
-{
-    DEFINE_STATIC_LOCAL(const AtomicString, optgroup, ("optgroup", AtomicString::ConstructFromLiteral));
-    return optgroup;
-}
-
 void HTMLOptGroupElement::childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta)
 {
     recalcSelectOptions();
     HTMLElement::childrenChanged(changedByParser, beforeChange, afterChange, childCountDelta);
 }
 
 void HTMLOptGroupElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
 {
     HTMLElement::parseAttribute(name, value);
     recalcSelectOptions();
@@ skipping 70 matching lines @@
 
 void HTMLOptGroupElement::accessKeyAction(bool)
 {
     HTMLSelectElement* select = ownerSelectElement();
     // send to the parent to bring focus to the list box
     if (select && !select->focused())
         select->accessKeyAction(false);
 }
 
 } // namespace