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_EncoderContext.h b/xfa/fxbarcode/datamatrix/BC_EncoderContext.h
index ddc6988dc3..0c1c8a6547 100644
--- a/xfa/fxbarcode/datamatrix/BC_EncoderContext.h
+++ b/xfa/fxbarcode/datamatrix/BC_EncoderContext.h
@@ -17,7 +17,8 @@ class CBC_EncoderContext : public CBC_SymbolShapeHint {
   CBC_EncoderContext(const CFX_WideString msg,
                      CFX_WideString ecLevel,
                      int32_t& e);
-  virtual ~CBC_EncoderContext();
+  ~CBC_EncoderContext() override;
+
   void setSymbolShape(SymbolShapeHint shape);
   void setSizeConstraints(CBC_Dimension* minSize, CBC_Dimension* maxSize);
   CFX_WideString getMessage();