Make code compile with clang_use_chrome_plugin (part III)

xfa/fxbarcode/datamatrix/BC_EncoderContext.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_DATAMATRIX_BC_ENCODERCONTEXT_H_
 #define XFA_FXBARCODE_DATAMATRIX_BC_ENCODERCONTEXT_H_
 
 #include "xfa/fxbarcode/datamatrix/BC_SymbolShapeHint.h"
 
 class CBC_SymbolInfo;
 class CBC_Dimension;
 
 class CBC_EncoderContext : public CBC_SymbolShapeHint {
  public:
   CBC_EncoderContext(const CFX_WideString msg,
                      CFX_WideString ecLevel,
                      int32_t& e);
-  virtual ~CBC_EncoderContext();
+  ~CBC_EncoderContext() override;
+
   void setSymbolShape(SymbolShapeHint shape);
   void setSizeConstraints(CBC_Dimension* minSize, CBC_Dimension* maxSize);
   CFX_WideString getMessage();
   void setSkipAtEnd(int32_t count);
   FX_WCHAR getCurrentChar();
   FX_WCHAR getCurrent();
   void writeCodewords(CFX_WideString codewords);
   void writeCodeword(FX_WCHAR codeword);
   int32_t getCodewordCount();
   void signalEncoderChange(int32_t encoding);
@@ skipping 15 matching lines @@
   int32_t getTotalMessageCharCount();
 
  private:
   SymbolShapeHint m_shape;
   CBC_Dimension* m_minSize;
   CBC_Dimension* m_maxSize;
   int32_t m_skipAtEnd;
 };
 
 #endif  // XFA_FXBARCODE_DATAMATRIX_BC_ENCODERCONTEXT_H_