Remove CLASSHASH defines in favour of an enum class.

xfa/fwl/basewidget/ifwl_monthcalendar.h

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #ifndef XFA_FWL_BASEWIDGET_IFWL_MONTHCALENDAR_H_
 #define XFA_FWL_BASEWIDGET_IFWL_MONTHCALENDAR_H_
 
 #include "xfa/fwl/core/ifwl_widget.h"
 #include "xfa/fwl/core/cfwl_event.h"
 #include "xfa/fwl/core/ifwl_dataprovider.h"
 #include "xfa/fwl/core/cfwl_widgetimpproperties.h"
 
 #define FWL_CLASS_MonthCalendar L"FWL_MONTHCALENDAR"
-#define FWL_CLASSHASH_MonthCalendar 2733931374
 #define FWL_STYLEEXT_MCD_MultiSelect (1L << 0)
 #define FWL_STYLEEXT_MCD_NoToday (1L << 1)
 #define FWL_STYLEEXT_MCD_NoTodayCircle (1L << 2)
 #define FWL_STYLEEXT_MCD_WeekNumbers (1L << 3)
 #define FWL_ITEMSTATE_MCD_Nomal (0L << 0)
 #define FWL_ITEMSTATE_MCD_Flag (1L << 0)
 #define FWL_ITEMSTATE_MCD_Selected (1L << 1)
 #define FWL_ITEMSTATE_MCD_Focused (1L << 2)
 
 BEGIN_FWL_EVENT_DEF(CFWL_Event_McdDateSelected, CFWL_EventType::DataSelected)
@@ skipping 25 matching lines @@
                     int32_t& iMonth,
                     int32_t& iDay,
                     int32_t nIndex = 0);
   FX_BOOL SetSelect(int32_t iYear, int32_t iMonth, int32_t iDay);
 
  protected:
   IFWL_MonthCalendar();
 };
 
 #endif  // XFA_FWL_BASEWIDGET_IFWL_MONTHCALENDAR_H_