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, 4 insertions, 0 deletions

diff --git a/xfa/fxbarcode/cbc_datamatrix.cpp b/xfa/fxbarcode/cbc_datamatrix.cpp
index 08b76830fd..5e37b54253 100644
--- a/xfa/fxbarcode/cbc_datamatrix.cpp
+++ b/xfa/fxbarcode/cbc_datamatrix.cpp
@@ -65,6 +65,10 @@ FX_BOOL CBC_DataMatrix::RenderBitmap(CFX_DIBitmap*& pOutBitmap, int32_t& e) {
   return TRUE;
 }
 
+BC_TYPE CBC_DataMatrix::GetType() {
+  return BC_DATAMATRIX;
+}
+
 CFX_WideString CBC_DataMatrix::Decode(uint8_t* buf,
                                       int32_t width,
                                       int32_t height,