Remove the GetCaption dataprovider method

xfa/fwl/core/ifwl_datetimepicker.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_DATETIMEPICKER_H_
 #define XFA_FWL_CORE_IFWL_DATETIMEPICKER_H_
 
 #include <memory>
@@ skipping 45 matching lines @@
   void GetWidgetRect(CFX_RectF& rect, bool bAutoSize = false) override;
   void Update() override;
   FWL_WidgetHit HitTest(FX_FLOAT fx, FX_FLOAT fy) override;
   void DrawWidget(CFX_Graphics* pGraphics,
                   const CFX_Matrix* pMatrix = nullptr) override;
   void SetThemeProvider(IFWL_ThemeProvider* pTP) override;
   void OnProcessMessage(CFWL_Message* pMessage) override;
   void OnDrawWidget(CFX_Graphics* pGraphics,
                     const CFX_Matrix* pMatrix) override;
 
-  // IFWL_Widget::DataProvider
-  void GetCaption(IFWL_Widget* pWidget, CFX_WideString& wsCaption) override;
-
   // IFWL_MonthCalendar::DataProvider
   int32_t GetCurDay(IFWL_Widget* pWidget) override;
   int32_t GetCurMonth(IFWL_Widget* pWidget) override;
   int32_t GetCurYear(IFWL_Widget* pWidget) override;
 
   void GetCurSel(int32_t& iYear, int32_t& iMonth, int32_t& iDay);
   void SetCurSel(int32_t iYear, int32_t iMonth, int32_t iDay);
 
   void SetEditText(const CFX_WideString& wsText);
   void GetEditText(CFX_WideString& wsText,
@@ skipping 52 matching lines @@
   int32_t m_iCurMonth;
   int32_t m_iCurDay;
   bool m_bLBtnDown;
   std::unique_ptr<IFWL_DateTimeEdit> m_pEdit;
   std::unique_ptr<IFWL_MonthCalendar> m_pMonthCal;
   std::unique_ptr<IFWL_FormProxy> m_pForm;
   FX_FLOAT m_fBtn;
 };
 
 #endif  // XFA_FWL_CORE_IFWL_DATETIMEPICKER_H_