Organize barcode codes into modules.

pdfium.gyp

 {
   'variables': {
     'pdf_use_skia%': 0,
   },
   'target_defaults': {
     'defines' : [
       'FT2_BUILD_LIBRARY',
       '_FPDFSDK_LIB',
       '_NO_GDIPLUS_',  # workaround text rendering issues on Windows
       'OPJ_STATIC',
@@ skipping 887 matching lines @@
         '<(DEPTH)/testing/gtest.gyp:gtest',
         'pdfium',
       ],
       'include_dirs': [
         '<(DEPTH)'
       ],
       'sources': [
         'testing/fx_string_testhelpers.h',
         'testing/fx_string_testhelpers.cpp',
         'core/src/fxcrt/fx_basic_bstring_unittest.cpp',
-        'xfa/src/fxbarcode/src/BC_PDF417HighLevelEncoder_unittest.cpp',
+        'xfa/src/fxbarcode/pdf417/BC_PDF417HighLevelEncoder_unittest.cpp',
       ],
     },
   ],
 }