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, 2 insertions, 1 deletions

diff --git a/xfa/fxbarcode/datamatrix/BC_HighLevelEncoder.h b/xfa/fxbarcode/datamatrix/BC_HighLevelEncoder.h
index 0aad4d4da5..550b601e53 100644
--- a/xfa/fxbarcode/datamatrix/BC_HighLevelEncoder.h
+++ b/xfa/fxbarcode/datamatrix/BC_HighLevelEncoder.h
@@ -19,7 +19,8 @@
 class CBC_HighLevelEncoder : public CBC_SymbolShapeHint {
  public:
   CBC_HighLevelEncoder();
-  virtual ~CBC_HighLevelEncoder();
+  ~CBC_HighLevelEncoder() override;
+
   CFX_ByteArray& getBytesForMessage(CFX_WideString msg);
   static CFX_WideString encodeHighLevel(CFX_WideString msg,
                                         CFX_WideString ecLevel,