Make code compile with clang_use_chrome_plugin (part III)

xfa/fxbarcode/pdf417/BC_PDF417Reader.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_PDF417_BC_PDF417READER_H_
 #define XFA_FXBARCODE_PDF417_BC_PDF417READER_H_
 
 #include "core/fxcrt/include/fx_string.h"
 #include "core/fxcrt/include/fx_system.h"
 #include "xfa/fxbarcode/BC_Reader.h"
 
 class CBC_BinaryBitmap;
 class CBC_ResultPoint;
 
 class CBC_PDF417Reader : public CBC_Reader {
  public:
   CBC_PDF417Reader();
-  virtual ~CBC_PDF417Reader();
-  CFX_ByteString Decode(CBC_BinaryBitmap* image, int32_t& e);
+  ~CBC_PDF417Reader() override;
+
+  // CBC_Reader
+  CFX_ByteString Decode(CBC_BinaryBitmap* image, int32_t& e) override;
+  CFX_ByteString Decode(CBC_BinaryBitmap* image,
+                        int32_t hints,
+                        int32_t& e) override;
+
   CFX_ByteString Decode(CBC_BinaryBitmap* image,
                         FX_BOOL multiple,
                         int32_t hints,
                         int32_t& e);
-  CFX_ByteString Decode(CBC_BinaryBitmap* image, int32_t hints, int32_t& e);
 
  private:
   static int32_t getMaxWidth(CBC_ResultPoint* p1, CBC_ResultPoint* p2);
   static int32_t getMinWidth(CBC_ResultPoint* p1, CBC_ResultPoint* p2);
   static int32_t getMaxCodewordWidth(
       const CFX_ArrayTemplate<CBC_ResultPoint*>& p);
   static int32_t getMinCodewordWidth(
       const CFX_ArrayTemplate<CBC_ResultPoint*>& p);
 };
 
 #endif  // XFA_FXBARCODE_PDF417_BC_PDF417READER_H_