Make code compile with clang_use_chrome_plugin (part III)

xfa/fxbarcode/oned/BC_OneDimReader.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_ONEDIMREADER_H_
 #define XFA_FXBARCODE_ONED_BC_ONEDIMREADER_H_
 
 #include "core/fxcrt/include/fx_basic.h"
 #include "xfa/fxbarcode/oned/BC_OneDReader.h"
 
 class CBC_CommonBitArray;
 
 class CBC_OneDimReader : public CBC_OneDReader {
  private:
   static const int32_t MAX_AVG_VARIANCE = (int32_t)(256 * 0.48f);
   static const int32_t MAX_INDIVIDUAL_VARIANCE = (int32_t)(256 * 0.7f);
 
   FX_BOOL CheckStandardUPCEANChecksum(CFX_ByteString& s, int32_t& e);
 
  public:
   static const int32_t START_END_PATTERN[3];
   static const int32_t MIDDLE_PATTERN[5];
   static const int32_t L_PATTERNS[10][4];
   static const int32_t L_AND_G_PATTERNS[20][4];
 
   CBC_OneDimReader();
-  virtual ~CBC_OneDimReader();
+  ~CBC_OneDimReader() override;
 
+  // CBC_OneDReader
   CFX_ByteString DecodeRow(int32_t rowNumber,
                            CBC_CommonBitArray* row,
                            int32_t hints,
-                           int32_t& e);
-  CFX_ByteString DecodeRow(int32_t rowNumber,
-                           CBC_CommonBitArray* row,
-                           CFX_Int32Array* startGuardRange,
-                           int32_t hints,
-                           int32_t& e);
+                           int32_t& e) override;
+
+  virtual CFX_ByteString DecodeRow(int32_t rowNumber,
+                                   CBC_CommonBitArray* row,
+                                   CFX_Int32Array* startGuardRange,
+                                   int32_t hints,
+                                   int32_t& e);
 
  protected:
   CFX_Int32Array* FindStartGuardPattern(CBC_CommonBitArray* row, int32_t& e);
   virtual FX_BOOL CheckChecksum(CFX_ByteString& s, int32_t& e);
   CFX_Int32Array* FindGuardPattern(CBC_CommonBitArray* row,
                                    int32_t rowOffset,
                                    FX_BOOL whiteFirst,
                                    CFX_Int32Array* pattern,
                                    int32_t& e);
   int32_t DecodeDigit(CBC_CommonBitArray* row,
                       CFX_Int32Array* counters,
                       int32_t rowOffset,
                       const int32_t* patterns,
                       int32_t patternLength,
                       int32_t& e);
   virtual int32_t DecodeMiddle(CBC_CommonBitArray* row,
                                CFX_Int32Array* startRange,
                                CFX_ByteString& resultResult,
-                               int32_t& e) {
-    return 0;
-  }
+                               int32_t& e) = 0;
   virtual CFX_Int32Array* DecodeEnd(CBC_CommonBitArray* row,
                                     int32_t endStart,
                                     int32_t& e);
 };
 
 #endif  // XFA_FXBARCODE_ONED_BC_ONEDIMREADER_H_