Make code compile with clang_use_chrome_plugin (part III)

xfa/fxbarcode/oned/BC_OnedEAN8Reader.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_FXBARCODE_ONED_BC_ONEDEAN8READER_H_
 #define XFA_FXBARCODE_ONED_BC_ONEDEAN8READER_H_
 
 #include "xfa/fxbarcode/oned/BC_OneDimReader.h"
 
 class CBC_CommonBitArray;
 
 class CBC_OnedEAN8Reader : public CBC_OneDimReader {
  public:
   CBC_OnedEAN8Reader();
-  virtual ~CBC_OnedEAN8Reader();
+  ~CBC_OnedEAN8Reader() override;
 
  protected:
   int32_t DecodeMiddle(CBC_CommonBitArray*,
                        CFX_Int32Array* startRange,
                        CFX_ByteString& result,
-                       int32_t& e);
+                       int32_t& e) override;
 };
 
 #endif  // XFA_FXBARCODE_ONED_BC_ONEDEAN8READER_H_