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, 6 insertions, 1 deletions

diff --git a/xfa/fxbarcode/BC_BufferedImageLuminanceSource.cpp b/xfa/fxbarcode/BC_BufferedImageLuminanceSource.cpp
index f822349972..7cdf957ce0 100644
--- a/xfa/fxbarcode/BC_BufferedImageLuminanceSource.cpp
+++ b/xfa/fxbarcode/BC_BufferedImageLuminanceSource.cpp
@@ -30,7 +30,8 @@
 
 class CBC_Pause : public IFX_Pause {
  public:
-  virtual FX_BOOL NeedToPauseNow() { return TRUE; }
+  // IFX_Pause
+  FX_BOOL NeedToPauseNow() override;
 };
 
 static CFX_DIBitmap* CreateDIBSource(IFX_FileRead* fileread) {
@@ -154,3 +155,7 @@ CFX_ByteArray* CBC_BufferedImageLuminanceSource::GetMatrix() {
   }
   return matrix;
 }
+
+FX_BOOL CBC_Pause::NeedToPauseNow() {
+  return TRUE;
+}