Make code compile with clang_use_chrome_plugin (part VI)

xfa/fwl/lightwidget/cfwl_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_LIGHTWIDGET_CFWL_DATETIMEPICKER_H_
 #define XFA_FWL_LIGHTWIDGET_CFWL_DATETIMEPICKER_H_
 
 #include "xfa/fwl/basewidget/ifwl_datetimepicker.h"
 #include "xfa/fwl/lightwidget/cfwl_widget.h"
 
 class CFWL_DateTimePicker : public CFWL_Widget {
  public:
   static CFWL_DateTimePicker* Create();
+
   FWL_Error Initialize(const CFWL_WidgetProperties* pProperties = NULL);
   FWL_Error SetToday(int32_t iYear, int32_t iMonth, int32_t iDay);
   FWL_Error GetEditText(CFX_WideString& wsText);
   FWL_Error SetEditText(const CFX_WideString& wsText);
   int32_t CountSelRanges();
   int32_t GetSelRange(int32_t nIndex, int32_t& nStart);
   FWL_Error GetCurSel(int32_t& iYear, int32_t& iMonth, int32_t& iDay);
   FWL_Error SetCurSel(int32_t iYear, int32_t iMonth, int32_t iDay);
   FX_BOOL CanUndo();
   FX_BOOL CanRedo();
   FX_BOOL Undo();
   FX_BOOL Redo();
   FX_BOOL CanCopy();
   FX_BOOL CanCut();
   FX_BOOL CanSelectAll();
   FX_BOOL Copy(CFX_WideString& wsCopy);
   FX_BOOL Cut(CFX_WideString& wsCut);
   FX_BOOL Paste(const CFX_WideString& wsPaste);
   FX_BOOL SelectAll();
   FX_BOOL Delete();
   FX_BOOL DeSelect();
   FWL_Error GetBBox(CFX_RectF& rect);
   FWL_Error SetEditLimit(int32_t nLimit);
   FWL_Error ModifyEditStylesEx(uint32_t dwStylesExAdded,
                                uint32_t dwStylesExRemoved);
 
  protected:
-  CFWL_DateTimePicker();
-  virtual ~CFWL_DateTimePicker();
   class CFWL_DateTimePickerDP : public IFWL_DateTimePickerDP {
    public:
     CFWL_DateTimePickerDP();
-    virtual FWL_Error GetCaption(IFWL_Widget* pWidget,
-                                 CFX_WideString& wsCaption);
-    virtual FWL_Error GetToday(IFWL_Widget* pWidget,
-                               int32_t& iYear,
-                               int32_t& iMonth,
-                               int32_t& iDay);
+
+    // IFWL_DataProvider
+    FWL_Error GetCaption(IFWL_Widget* pWidget,
+                         CFX_WideString& wsCaption) override;
+
+    // IFWL_DateTimePickerDP
+    FWL_Error GetToday(IFWL_Widget* pWidget,
+                       int32_t& iYear,
+                       int32_t& iMonth,
+                       int32_t& iDay) override;
     int32_t m_iYear;
     int32_t m_iMonth;
     int32_t m_iDay;
     CFX_WideString m_wsData;
   };
+
+  CFWL_DateTimePicker();
+  ~CFWL_DateTimePicker() override;
+
   CFWL_DateTimePickerDP m_DateTimePickerDP;
 };
 
 #endif  // XFA_FWL_LIGHTWIDGET_CFWL_DATETIMEPICKER_H_