Remove unnecessary Document.h includes in .cpp files

Source/core/dom/StyleSheetScopingNodeList.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 11 matching lines @@
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #include "config.h"
 #include "core/dom/StyleSheetScopingNodeList.h"
 
 #include "core/dom/Document.h"
-#include "core/dom/Node.h"
 
 namespace WebCore {
 
 void StyleSheetScopingNodeList::add(ContainerNode* node)
 {
     ASSERT(node && node->inDocument());
     if (isTreeScopeRoot(node))
         return;
 
     if (!m_scopingNodes)
@@ skipping 13 matching lines @@
     if (node->inDocument())
         return;
 
     m_scopingNodes->remove(node);
     if (!m_scopingNodesRemoved)
         m_scopingNodesRemoved = adoptPtr(new ListHashSet<Node*, 4>());
     m_scopingNodesRemoved->add(node);
 }
 
 }