Cleanup: Mark methods with the override keyword.

fpdfsdk/src/formfiller/FFL_TextField.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/FFL_TextField.h"
 #include "../../include/formfiller/FFL_CBA_Fontmap.h"
 
 /* ------------------------------- CFFL_TextField
@@ skipping 269 matching lines @@
 
     pEdit->SetReadyToInput();
     CFX_WideString wsText = pEdit->GetText();
     int nCharacters = wsText.GetLength();
     CFX_ByteString bsUTFText = wsText.UTF16LE_Encode();
     unsigned short* pBuffer = (unsigned short*)bsUTFText.c_str();
     m_pApp->FFI_OnSetFieldInputFocus(m_pWidget->GetFormField(), pBuffer,
                                      nCharacters, TRUE);
 
     pEdit->SetEditNotify(this);
-    // pUndo->BeginEdit(pDocument);
   }
 }
 
 void CFFL_TextField::OnKillFocus(CPWL_Wnd* pWnd) {}
 
-FX_BOOL CFFL_TextField::CanCopy(CPDFSDK_Document* pDocument) {
-  return FALSE;
-}
-
-FX_BOOL CFFL_TextField::CanCut(CPDFSDK_Document* pDocument) {
-  return FALSE;
-}
-
-FX_BOOL CFFL_TextField::CanPaste(CPDFSDK_Document* pDocument) {
-  return FALSE;
-}
-
 void CFFL_TextField::OnAddUndo(CPWL_Edit* pEdit) {}