Cleanup IFWL_Widget visibility and virtual parameters

xfa/fwl/core/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_CORE_IFWL_MONTHCALENDAR_H_
 #define XFA_FWL_CORE_IFWL_MONTHCALENDAR_H_
 
 #include "xfa/fgas/localization/fgas_datetime.h"
@@ skipping 39 matching lines @@
 
 class IFWL_MonthCalendar : public IFWL_Widget {
  public:
   IFWL_MonthCalendar(const IFWL_App* app,
                      std::unique_ptr<CFWL_WidgetProperties> properties,
                      IFWL_Widget* pOuter);
   ~IFWL_MonthCalendar() override;
 
   // FWL_WidgetImp
   FWL_Type GetClassID() const override;
-  FWL_Error GetWidgetRect(CFX_RectF& rect, bool bAutoSize = false) override;
-  FWL_Error Update() override;
-  FWL_Error DrawWidget(CFX_Graphics* pGraphics,
-                       const CFX_Matrix* pMatrix = nullptr) override;
+  void GetWidgetRect(CFX_RectF& rect, bool bAutoSize = false) override;
+  void Update() override;
+  void DrawWidget(CFX_Graphics* pGraphics,
+                  const CFX_Matrix* pMatrix = nullptr) override;
   void OnProcessMessage(CFWL_Message* pMessage) override;
   void OnDrawWidget(CFX_Graphics* pGraphics,
                     const CFX_Matrix* pMatrix) override;
 
   int32_t CountSelect();
   bool GetSelect(int32_t& iYear,
                  int32_t& iMonth,
                  int32_t& iDay,
                  int32_t nIndex = 0);
   bool SetSelect(int32_t iYear, int32_t iMonth, int32_t iDay);
@@ skipping 182 matching lines @@
   ~FWL_DATEINFO();
 
   int32_t iDay;
   int32_t iDayOfWeek;
   uint32_t dwStates;
   CFX_RectF rect;
   CFX_WideString wsDay;
 };
 
 #endif  // XFA_FWL_CORE_IFWL_MONTHCALENDAR_H_