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

Source/core/html/DateInputType.h

 /*
  * Copyright (C) 2010 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 15 matching lines @@
  * 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 DateInputType_h
 #define DateInputType_h
 
 #include "core/html/BaseChooserOnlyDateAndTimeInputType.h"
 #include "core/html/BaseMultipleFieldsDateAndTimeInputType.h"
-#include <wtf/RefPtr.h>
 
 namespace WebCore {
 
 class PickerIndicatorElement;
 
 #if ENABLE(INPUT_MULTIPLE_FIELDS_UI)
 typedef BaseMultipleFieldsDateAndTimeInputType BaseDateInputType;
 #else
 typedef BaseChooserOnlyDateAndTimeInputType BaseDateInputType;
 #endif
@@ skipping 16 matching lines @@
     // BaseMultipleFieldsDateAndTimeInputType functions
     virtual String formatDateTimeFieldsState(const DateTimeFieldsState&) const OVERRIDE;
     virtual void setupLayoutParameters(DateTimeEditElement::LayoutParameters&, const DateComponents&) const OVERRIDE;
     virtual bool isValidFormat(bool hasYear, bool hasMonth, bool hasWeek, bool hasDay, bool hasAMPM, bool hasHour, bool hasMinute, bool hasSecond) const;
 #endif
 };
 
 } // namespace WebCore
 
 #endif // DateInputType_h