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

Source/core/dom/Event.h

 /*
  * Copyright (C) 2001 Peter Kelly (pmk@post.com)
  * Copyright (C) 2001 Tobias Anton (anton@stud.fbi.fh-darmstadt.de)
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * 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 Event_h
 #define Event_h
 
 #include "bindings/v8/ScriptWrappable.h"
 #include "core/dom/DOMTimeStamp.h"
 #include "core/dom/EventContext.h"
-#include "core/dom/EventNames.h"
-#include <wtf/HashMap.h>
-#include <wtf/ListHashSet.h>
 #include <wtf/RefCounted.h>
 #include <wtf/text/AtomicString.h>
 
 namespace WebCore {
 
 class Clipboard;
 class EventTarget;
 class EventDispatcher;
 class HTMLIFrameElement;
 
@@ skipping 151 matching lines @@
     EventTarget* m_currentTarget;
     RefPtr<EventTarget> m_target;
     DOMTimeStamp m_createTime;
     RefPtr<Event> m_underlyingEvent;
     EventPath m_eventPath;
 };
 
 } // namespace WebCore
 
 #endif // Event_h