Make code compile with clang_use_chrome_plugin (part III)

xfa/fxbarcode/datamatrix/BC_C40Encoder.h

Index: xfa/fxbarcode/datamatrix/BC_C40Encoder.h
diff --git a/xfa/fxbarcode/datamatrix/BC_C40Encoder.h b/xfa/fxbarcode/datamatrix/BC_C40Encoder.h
index 9dcb1e5c5f3b6decd72f67ce21759ccd6796e6fb..9737981f75b23f59ef3f786dd9c9b3d140dd36c6 100644
--- a/xfa/fxbarcode/datamatrix/BC_C40Encoder.h
+++ b/xfa/fxbarcode/datamatrix/BC_C40Encoder.h
@@ -12,11 +12,15 @@
 class CBC_C40Encoder : public CBC_Encoder {
  public:
   CBC_C40Encoder();
-  virtual ~CBC_C40Encoder();
-  virtual int32_t getEncodingMode();
-  virtual void Encode(CBC_EncoderContext& context, int32_t& e);
+  ~CBC_C40Encoder() override;
+
+  // CBC_Encoder
+  int32_t getEncodingMode() override;
+  void Encode(CBC_EncoderContext& context, int32_t& e) override;
+
   static void writeNextTriplet(CBC_EncoderContext& context,
                                CFX_WideString& buffer);
+
   virtual void handleEOD(CBC_EncoderContext& context,
                          CFX_WideString& buffer,
                          int32_t& e);