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, 0 deletions

diff --git a/xfa/fxbarcode/datamatrix/BC_Encoder.h b/xfa/fxbarcode/datamatrix/BC_Encoder.h
index 78dc6ac447..68a223fee1 100644
--- a/xfa/fxbarcode/datamatrix/BC_Encoder.h
+++ b/xfa/fxbarcode/datamatrix/BC_Encoder.h
@@ -10,10 +10,12 @@
 #include "xfa/fxbarcode/utils.h"
 
 class CBC_EncoderContext;
+
 class CBC_Encoder {
  public:
   CBC_Encoder();
   virtual ~CBC_Encoder();
+
   virtual int32_t getEncodingMode() = 0;
   virtual void Encode(CBC_EncoderContext& context, int32_t& e) = 0;
 };