Remove unused includes from core/html .cpp files

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 11 matching lines @@
  *
  */
 
 #include "config.h"
 #include "core/html/HTMLOptGroupElement.h"
 
 #include "HTMLNames.h"
 #include "core/css/resolver/StyleResolver.h"
 #include "core/dom/Document.h"
 #include "core/dom/NodeRenderStyle.h"
-#include "core/dom/NodeRenderingContext.h"
 #include "core/html/HTMLSelectElement.h"
-#include "core/rendering/RenderMenuList.h"
 #include <wtf/StdLibExtras.h>
 
 namespace WebCore {
 
 using namespace HTMLNames;
 
 inline HTMLOptGroupElement::HTMLOptGroupElement(const QualifiedName& tagName, Document* document)
     : HTMLElement(tagName, document)
 {
     ASSERT(hasTagName(optgroupTag));
@@ skipping 112 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