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

Source/core/html/BaseDateAndTimeInputType.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 BaseDateAndTimeInputType_h
 #define BaseDateAndTimeInputType_h
 
 #include "core/html/InputType.h"
 #include "core/platform/DateComponents.h"
-#include <wtf/unicode/Unicode.h>
 
 namespace WebCore {
 
 // A super class of date, datetime, datetime-local, month, time, and week types.
 class BaseDateAndTimeInputType : public InputType {
 protected:
     BaseDateAndTimeInputType(HTMLInputElement* element) : InputType(element) { }
     virtual Decimal parseToNumber(const String&, const Decimal&) const OVERRIDE;
     virtual bool parseToDateComponents(const String&, DateComponents*) const OVERRIDE;
     virtual String sanitizeValue(const String&) const OVERRIDE;
@@ skipping 15 matching lines @@
     virtual Decimal defaultValueForStepUp() const OVERRIDE;
     virtual bool isSteppable() const OVERRIDE;
     virtual String serializeWithMilliseconds(double) const;
     virtual String localizeValue(const String&) const OVERRIDE;
     virtual bool supportsReadOnly() const OVERRIDE;
     virtual bool shouldRespectListAttribute() OVERRIDE;
 };
 
 } // namespace WebCore
 #endif // BaseDateAndTimeInputType_h