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, 3 insertions, 2 deletions

diff --git a/xfa/fxbarcode/oned/BC_OnedCode39Reader.h b/xfa/fxbarcode/oned/BC_OnedCode39Reader.h
index 0d4591f95b..0e1a728a47 100644
--- a/xfa/fxbarcode/oned/BC_OnedCode39Reader.h
+++ b/xfa/fxbarcode/oned/BC_OnedCode39Reader.h
@@ -22,12 +22,13 @@ class CBC_OnedCode39Reader : public CBC_OneDReader {
   CBC_OnedCode39Reader();
   explicit CBC_OnedCode39Reader(FX_BOOL usingCheckDigit);
   CBC_OnedCode39Reader(FX_BOOL usingCheckDigit, FX_BOOL extendedMode);
-  virtual ~CBC_OnedCode39Reader();
+  ~CBC_OnedCode39Reader() override;
 
+  // CBC_OneDReader
   CFX_ByteString DecodeRow(int32_t rowNumber,
                            CBC_CommonBitArray* row,
                            int32_t hints,
-                           int32_t& e);
+                           int32_t& e) override;
 
  private:
   CFX_Int32Array* FindAsteriskPattern(CBC_CommonBitArray* row, int32_t& e);