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/qrcode/BC_QRCodeReader.h b/xfa/fxbarcode/qrcode/BC_QRCodeReader.h
index c11ccd1f26..b3a72b4d18 100644
--- a/xfa/fxbarcode/qrcode/BC_QRCodeReader.h
+++ b/xfa/fxbarcode/qrcode/BC_QRCodeReader.h
@@ -22,7 +22,8 @@ class CBC_QRCodeReader : public CBC_Reader {
 
  public:
   CBC_QRCodeReader();
-  virtual ~CBC_QRCodeReader();
+  ~CBC_QRCodeReader() override;
+
   CFX_ByteString Decode(CFX_DIBitmap* pBitmap,
                         int32_t hints,
                         int32_t byteModeDecode,
@@ -32,8 +33,12 @@ class CBC_QRCodeReader : public CBC_Reader {
                         int32_t byteModeDecode,
                         int32_t& e);
   static void ReleaseAll();
-  CFX_ByteString Decode(CBC_BinaryBitmap* image, int32_t hints, int32_t& e);
-  CFX_ByteString Decode(CBC_BinaryBitmap* image, int32_t& e);
+
+  // CBC_Reader
+  CFX_ByteString Decode(CBC_BinaryBitmap* image,
+                        int32_t hints,
+                        int32_t& e) override;
+  CFX_ByteString Decode(CBC_BinaryBitmap* image, int32_t& e) override;
   virtual void Init();
 };