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

Source/core/html/DateTimeFieldsState.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * 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
  *     notice, this list of conditions and the following disclaimer in the
  *     documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */
 
 #ifndef DateTimeFieldsState_h
 #define DateTimeFieldsState_h
 
 #if ENABLE(INPUT_MULTIPLE_FIELDS_UI)
-#include <wtf/text/WTFString.h>
 
 namespace WebCore {
 
 class FormControlState;
 
 // DateTimeFieldsState represents fields in date/time for form state
 // save/restore for input type "date", "datetime", "datetime-local", "month",
 // "time", and "week" with multiple fields input UI.
 //
 // Each field can contain invalid value for date, e.g. day of month field can
@@ skipping 53 matching lines @@
     unsigned m_second;
     unsigned m_millisecond;
     unsigned m_weekOfYear;
     AMPMValue m_ampm;
 };
 
 } // namespace WebCore
 
 #endif
 #endif