Remove ~1750 superfluous includes from core

Source/core/html/HTMLHRElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2010 Apple Inc. All rights reserved.
  *
  * 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
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 10 matching lines @@
  */
 
 #include "config.h"
 #include "core/html/HTMLHRElement.h"
 
 #include "CSSPropertyNames.h"
 #include "CSSValueKeywords.h"
 #include "HTMLNames.h"
 #include "core/css/CSSValuePool.h"
 #include "core/css/StylePropertySet.h"
-#include "core/dom/Attribute.h"
 
 namespace WebCore {
 
 using namespace HTMLNames;
 
 HTMLHRElement::HTMLHRElement(const QualifiedName& tagName, Document* document)
     : HTMLElement(tagName, document)
 {
     ASSERT(hasTagName(hrTag));
     ScriptWrappable::init(this);
@@ skipping 51 matching lines @@
         int size = si->toInt();
         if (size <= 1)
             addPropertyToPresentationAttributeStyle(style, CSSPropertyBorderBottomWidth, 0, CSSPrimitiveValue::CSS_PX);
         else
             addPropertyToPresentationAttributeStyle(style, CSSPropertyHeight, size - 2, CSSPrimitiveValue::CSS_PX);
     } else
         HTMLElement::collectStyleForPresentationAttribute(name, value, style);
 }
 
 }