Remove unused includes from core/{editing,fileapi,history,html}

Source/core/html/HTMLLegendElement.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 11 matching lines @@
  *
  */
 
 #include "config.h"
 #include "core/html/HTMLLegendElement.h"
 
 #include "HTMLNames.h"
 #include "core/dom/NodeTraversal.h"
 #include "core/html/HTMLFieldSetElement.h"
 #include "core/html/HTMLFormControlElement.h"
-#include <wtf/StdLibExtras.h>
 
 namespace WebCore {
 
 using namespace HTMLNames;
 
 
 inline HTMLLegendElement::HTMLLegendElement(const QualifiedName& tagName, Document* document)
     : HTMLElement(tagName, document)
 {
     ASSERT(hasTagName(legendTag));
@@ skipping 47 matching lines @@
     // its parent, then the form attribute must return the same value as the
     // form attribute on that fieldset element. Otherwise, it must return null.
     ContainerNode* fieldset = parentNode();
     if (!fieldset || !fieldset->hasTagName(fieldsetTag))
         return 0;
 
     return static_cast<HTMLFieldSetElement*>(fieldset)->form();
 }
     
 } // namespace