Make code compile with clang_use_chrome_plugin (part III)

xfa/fxbarcode/oned/BC_OnedUPCAReader.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_ONEDUPCAREADER_H_
 #define XFA_FXBARCODE_ONED_BC_ONEDUPCAREADER_H_
 
 #include "core/fxcrt/include/fx_string.h"
 #include "core/fxcrt/include/fx_system.h"
 #include "xfa/fxbarcode/oned/BC_OneDimReader.h"
 
 class CBC_BinaryBitmap;
 class CBC_CommonBitArray;
 class CBC_OnedEAN13Reader;
 
 class CBC_OnedUPCAReader : public CBC_OneDimReader {
  public:
   CBC_OnedUPCAReader();
-  virtual ~CBC_OnedUPCAReader();
+  ~CBC_OnedUPCAReader() override;
 
   virtual void Init();
 
+  // CBC_OneDimReader
   CFX_ByteString DecodeRow(int32_t rowNumber,
                            CBC_CommonBitArray* row,
                            int32_t hints,
-                           int32_t& e);
+                           int32_t& e) override;
   CFX_ByteString DecodeRow(int32_t rowNumber,
                            CBC_CommonBitArray* row,
                            CFX_Int32Array* startGuardRange,
                            int32_t hints,
-                           int32_t& e);
-  CFX_ByteString Decode(CBC_BinaryBitmap* image, int32_t& e);
-  CFX_ByteString Decode(CBC_BinaryBitmap* image, int32_t hints, int32_t& e);
+                           int32_t& e) override;
+
+  // CBC_OneDReader
+  CFX_ByteString Decode(CBC_BinaryBitmap* image, int32_t& e) override;
+  CFX_ByteString Decode(CBC_BinaryBitmap* image,
+                        int32_t hints,
+                        int32_t& e) override;
 
  protected:
   int32_t DecodeMiddle(CBC_CommonBitArray* row,
                        CFX_Int32Array* startRange,
                        CFX_ByteString& resultString,
-                       int32_t& e);
+                       int32_t& e) override;
   CFX_ByteString MaybeReturnResult(CFX_ByteString& result, int32_t& e);
 
  private:
   CBC_OnedEAN13Reader* m_ean13Reader;
 };
 
 #endif  // XFA_FXBARCODE_ONED_BC_ONEDUPCAREADER_H_