Make code compile with clang_use_chrome_plugin (part III)

xfa/fxbarcode/common/BC_GlobalHistogramBinarizer.h

Index: xfa/fxbarcode/common/BC_GlobalHistogramBinarizer.h
diff --git a/xfa/fxbarcode/common/BC_GlobalHistogramBinarizer.h b/xfa/fxbarcode/common/BC_GlobalHistogramBinarizer.h
index 01ac9a6c2ace38517a126f4c71fad942b9484084..786e8e0a53f9aa3ab45e17faf1e7098c1315506f 100644
--- a/xfa/fxbarcode/common/BC_GlobalHistogramBinarizer.h
+++ b/xfa/fxbarcode/common/BC_GlobalHistogramBinarizer.h
@@ -17,13 +17,16 @@ class CBC_LuminanceSource;
 class CBC_GlobalHistogramBinarizer : public CBC_Binarizer {
  public:
   CBC_GlobalHistogramBinarizer(CBC_LuminanceSource* source);
-  virtual ~CBC_GlobalHistogramBinarizer();
+  ~CBC_GlobalHistogramBinarizer() override;
 
   void InitArrays(int32_t luminanceSize);
-  CBC_CommonBitMatrix* GetBlackMatrix(int32_t& e);
+
+  // CBC_Binarizer
+  CBC_CommonBitMatrix* GetBlackMatrix(int32_t& e) override;
   CBC_CommonBitArray* GetBlackRow(int32_t y,
                                   CBC_CommonBitArray* row,
-                                  int32_t& e);
+                                  int32_t& e) override;
+
   static int32_t EstimateBlackPoint(CFX_Int32Array& buckets, int32_t& e);
 
  private: