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, 8 insertions, 3 deletions

diff --git a/xfa/fxbarcode/pdf417/BC_PDF417Reader.h b/xfa/fxbarcode/pdf417/BC_PDF417Reader.h
index 73499b9cdf..193d7efdee 100644
--- a/xfa/fxbarcode/pdf417/BC_PDF417Reader.h
+++ b/xfa/fxbarcode/pdf417/BC_PDF417Reader.h
@@ -17,13 +17,18 @@ class CBC_ResultPoint;
 class CBC_PDF417Reader : public CBC_Reader {
  public:
   CBC_PDF417Reader();
-  virtual ~CBC_PDF417Reader();
-  CFX_ByteString Decode(CBC_BinaryBitmap* image, int32_t& e);
+  ~CBC_PDF417Reader() override;
+
+  // CBC_Reader
+  CFX_ByteString Decode(CBC_BinaryBitmap* image, int32_t& e) override;
+  CFX_ByteString Decode(CBC_BinaryBitmap* image,
+                        int32_t hints,
+                        int32_t& e) override;
+
   CFX_ByteString Decode(CBC_BinaryBitmap* image,
                         FX_BOOL multiple,
                         int32_t hints,
                         int32_t& e);
-  CFX_ByteString Decode(CBC_BinaryBitmap* image, int32_t hints, int32_t& e);
 
  private:
   static int32_t getMaxWidth(CBC_ResultPoint* p1, CBC_ResultPoint* p2);