Remove duplicated headers from core/

Source/core/dom/StyleEngine.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 15 matching lines @@
  */
 
 #include "config.h"
 #include "core/dom/StyleEngine.h"
 
 #include "HTMLNames.h"
 #include "SVGNames.h"
 #include "core/css/CSSStyleSheet.h"
 #include "core/css/StyleInvalidationAnalysis.h"
 #include "core/css/StyleSheetContents.h"
-#include "core/dom/Document.h"
 #include "core/dom/Element.h"
 #include "core/dom/ProcessingInstruction.h"
 #include "core/dom/ShadowTreeStyleSheetCollection.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/html/HTMLIFrameElement.h"
 #include "core/html/HTMLLinkElement.h"
 #include "core/html/HTMLStyleElement.h"
 #include "core/inspector/InspectorInstrumentation.h"
 #include "core/page/Page.h"
 #include "core/page/PageGroup.h"
@@ skipping 414 matching lines @@
     if (m_document.didLayoutWithPendingStylesheets() && !hasPendingSheets())
         change.setNeedsRepaint();
 
     if (updateActiveStyleSheets(mode))
         change.setNeedsStyleRecalc();
 
     return change;
 }
 
 }