Make code compile with clang_use_chrome_plugin (part III)

This change contains files in xfa/fxbarcode directory.
This is part of the efforts to make PDFium code compilable
by Clang chromium style plugins.

The changes are mainly the following:
-- move inline constructor/destructor of complex class/struct out-of-line;
-- add constructor/destructor of complex class/struct if not
 explicitly defined;
-- add explicit out-of-line copy constructor when needed;
-- move inline virtual functions out-of-line;
-- Properly mark virtual functions with 'override';
-- some minor cleanups;

BUG=pdfium:469

Review-Url: https://codereview.chromium.org/2067903002

1 files changed, 6 insertions, 3 deletions

diff --git a/xfa/fxbarcode/common/BC_GlobalHistogramBinarizer.h b/xfa/fxbarcode/common/BC_GlobalHistogramBinarizer.h
index 01ac9a6c2a..786e8e0a53 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: