Use override in more classes in fpdfsdk/

fpdfsdk/include/fxedit/fx_edit.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 FPDFSDK_INCLUDE_FXEDIT_FX_EDIT_H_
 #define FPDFSDK_INCLUDE_FXEDIT_FX_EDIT_H_
 
 #include "../../../core/include/fxcrt/fx_basic.h"
@@ skipping 459 matching lines @@
       const CPDF_Point& ptOffset,
       const CPVT_WordRange* pRange,
       CFX_ArrayTemplate<CPDF_TextObject*>& ObjArray);
   static void GenerateUnderlineObjects(CPDF_PageObjects* pPageObjects,
                                        IFX_Edit* pEdit,
                                        const CPDF_Point& ptOffset,
                                        const CPVT_WordRange* pRange,
                                        FX_COLORREF color);
 
  protected:
-  ~IFX_Edit() {}
+  virtual ~IFX_Edit() {}
 };
 
 class IFX_List_Notify {
  public:
-  virtual ~IFX_List_Notify() {}
   // set the horizontal scrollbar information.
   virtual void IOnSetScrollInfoX(FX_FLOAT fPlateMin,
                                  FX_FLOAT fPlateMax,
                                  FX_FLOAT fContentMin,
                                  FX_FLOAT fContentMax,
                                  FX_FLOAT fSmallStep,
                                  FX_FLOAT fBigStep) = 0;
   // set the vertical scrollbar information.
   virtual void IOnSetScrollInfoY(FX_FLOAT fPlateMin,
                                  FX_FLOAT fPlateMax,
                                  FX_FLOAT fContentMin,
                                  FX_FLOAT fContentMax,
                                  FX_FLOAT fSmallStep,
                                  FX_FLOAT fBigStep) = 0;
   // set the position of horizontal scrollbar.
   virtual void IOnSetScrollPosX(FX_FLOAT fx) = 0;
   // set the position of vertical scrollbar.
   virtual void IOnSetScrollPosY(FX_FLOAT fy) = 0;
   // Invalidate the rectangle relative to the bounding box of edit.
   virtual void IOnInvalidateRect(CPDF_Rect* pRect) = 0;
+
+ protected:
+  virtual ~IFX_List_Notify() {}
 };
 
 class IFX_List {
  public:
   static IFX_List* NewList();
   static void DelList(IFX_List* pList);
 
   virtual void SetFontMap(IFX_Edit_FontMap* pFontMap) = 0;
   virtual void SetNotify(IFX_List_Notify* pNotify) = 0;
 
@@ skipping 40 matching lines @@
   virtual void OnVK_UP(FX_BOOL bShift, FX_BOOL bCtrl) = 0;
   virtual void OnVK_DOWN(FX_BOOL bShift, FX_BOOL bCtrl) = 0;
   virtual void OnVK_LEFT(FX_BOOL bShift, FX_BOOL bCtrl) = 0;
   virtual void OnVK_RIGHT(FX_BOOL bShift, FX_BOOL bCtrl) = 0;
   virtual void OnVK_HOME(FX_BOOL bShift, FX_BOOL bCtrl) = 0;
   virtual void OnVK_END(FX_BOOL bShift, FX_BOOL bCtrl) = 0;
   virtual void OnVK(int32_t nItemIndex, FX_BOOL bShift, FX_BOOL bCtrl) = 0;
   virtual FX_BOOL OnChar(FX_WORD nChar, FX_BOOL bShift, FX_BOOL bCtrl) = 0;
 
  protected:
-  ~IFX_List() {}
+  virtual ~IFX_List() {}
 };
 
 #endif  // FPDFSDK_INCLUDE_FXEDIT_FX_EDIT_H_