Remove unused includes from core/{editing,fileapi,history,html}

Source/core/html/PublicURLManager.h

 /*
  * Copyright (C) 2012 Motorola Mobility Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 12 matching lines @@
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef PublicURLManager_h
 #define PublicURLManager_h
 
 #include "core/dom/ActiveDOMObject.h"
 #include "wtf/HashMap.h"
 #include "wtf/HashSet.h"
 #include "wtf/PassOwnPtr.h"
-#include "wtf/RefCounted.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
 class KURL;
 class ScriptExecutionContext;
 class SecurityOrigin;
 class URLRegistry;
 class URLRegistrable;
 
@@ skipping 13 matching lines @@
 
     typedef HashSet<String> URLSet;
     typedef HashMap<URLRegistry*, URLSet > RegistryURLMap;
     RegistryURLMap m_registryToURL;
     bool m_isStopped;
 };
 
 } // namespace WebCore
 
 #endif // PUBLICURLMANAGER_h