Cleanup: Mark methods with the override keyword.

fpdfsdk/src/formfiller/FFL_TextField.cpp

Index: fpdfsdk/src/formfiller/FFL_TextField.cpp
diff --git a/fpdfsdk/src/formfiller/FFL_TextField.cpp b/fpdfsdk/src/formfiller/FFL_TextField.cpp
index 2acf6b8fda9b4a37f5d0ff86932b9605f861b5ca..b95ac9356f68177fb75f5442a806eb920f8e983d 100644
--- a/fpdfsdk/src/formfiller/FFL_TextField.cpp
+++ b/fpdfsdk/src/formfiller/FFL_TextField.cpp
@@ -287,22 +287,9 @@ void CFFL_TextField::OnSetFocus(CPWL_Wnd* pWnd) {
                                      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) {}