Cleanup: Mark methods with the override keyword.

fpdfsdk/src/formfiller/FFL_ComboBox.cpp

 // 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
 
 #include "../../include/formfiller/FormFiller.h"
 #include "../../include/formfiller/FFL_FormFiller.h"
 #include "../../include/formfiller/FFL_IFormFiller.h"
 #include "../../include/formfiller/FFL_CBA_Fontmap.h"
@@ skipping 282 matching lines @@
                                      nCharacters, TRUE);
 
     pEdit->SetEditNotify(this);
   }
 }
 
 void CFFL_ComboBox::OnKillFocus(CPWL_Wnd* pWnd) {
   ASSERT(m_pApp != NULL);
 }
 
-FX_BOOL CFFL_ComboBox::CanCopy(CPDFSDK_Document* pDocument) {
-  ASSERT(pDocument != NULL);
-
-  return FALSE;
-}
-
-FX_BOOL CFFL_ComboBox::CanCut(CPDFSDK_Document* pDocument) {
-  ASSERT(pDocument != NULL);
-
-  return FALSE;
-}
-
-FX_BOOL CFFL_ComboBox::CanPaste(CPDFSDK_Document* pDocument) {
-  ASSERT(pDocument != NULL);
-
-  return FALSE;
-}
-
 void CFFL_ComboBox::OnAddUndo(CPWL_Edit* pEdit) {
   ASSERT(pEdit != NULL);
 }
 
 CFX_WideString CFFL_ComboBox::GetSelectExportText() {
   CFX_WideString swRet;
 
   int nExport = -1;
   CPDFSDK_PageView* pPageView = GetCurPageView();
   if (CPWL_ComboBox* pComboBox =
           (CPWL_ComboBox*)GetPDFWindow(pPageView, FALSE)) {
     nExport = pComboBox->GetSelect();
   }
 
   if (nExport >= 0) {
     if (CPDF_FormField* pFormField = m_pWidget->GetFormField()) {
       swRet = pFormField->GetOptionValue(nExport);
       if (swRet.IsEmpty())
         swRet = pFormField->GetOptionLabel(nExport);
     }
   }
 
   return swRet;
 }