Kill dead IFWL_*::Initialize() variants dead.

xfa/include/fwl/basewidget/fwl_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 _FWL_MONTHCALENDAR_H
 #define _FWL_MONTHCALENDAR_H
 class IFWL_MonthCalendarDP;
 class IFWL_MonthCalendar;
@@ skipping 98 matching lines @@
 class IFWL_MonthCalendarDP : public IFWL_DataProvider {
  public:
   virtual int32_t GetCurDay(IFWL_Widget* pWidget) = 0;
   virtual int32_t GetCurMonth(IFWL_Widget* pWidget) = 0;
   virtual int32_t GetCurYear(IFWL_Widget* pWidget) = 0;
 };
 class IFWL_MonthCalendar : public IFWL_Widget {
  public:
   static IFWL_MonthCalendar* Create();
 
-  FWL_ERR Initialize(IFWL_Widget* pOuter = NULL);
   FWL_ERR Initialize(const CFWL_WidgetImpProperties& properties,
-                     IFWL_Widget* pOuter = NULL);
+                     IFWL_Widget* pOuter);
   int32_t CountSelect();
   FX_BOOL GetSelect(int32_t& iYear,
                     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