Remove unused includes from core/accessibility, core/css and core/dom

Source/core/css/SelectorChecker.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 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.
  */
 
 #ifndef SelectorChecker_h
 #define SelectorChecker_h
 
 #include "core/css/CSSSelector.h"
-#include "core/dom/SpaceSplitString.h"
 #include "core/inspector/InspectorInstrumentation.h"
-#include <wtf/HashSet.h>
-#include <wtf/Vector.h>
 
 namespace WebCore {
 
 class CSSSelector;
 class Element;
 class RenderScrollbar;
 class RenderStyle;
 
 class SelectorChecker {
     WTF_MAKE_NONCOPYABLE(SelectorChecker);
@@ skipping 103 matching lines @@
         const Attribute* attribute = element->attributeItem(i);
         if (attribute->matches(selectorAttributeName) && (!value || attribute->value().impl() == value))
             return true;
     }
     return false;
 }
 
 }
 
 #endif