Remove include only barcode.h and IWYU.

xfa.gyp

 {
   "variables": {
     "pdf_enable_v8%": 1,
   },
   "target_defaults": {
     "defines": [
       "PDF_ENABLE_XFA",
     ],
   },
   "targets":[
@@ skipping 495 matching lines @@
         "xfa/src/fxbarcode/BC_BufferedImageLuminanceSource.h",
         "xfa/src/fxbarcode/BC_DecoderResult.h",
         "xfa/src/fxbarcode/BC_Dimension.h",
         "xfa/src/fxbarcode/BC_LuminanceSource.h",
         "xfa/src/fxbarcode/BC_Reader.h",
         "xfa/src/fxbarcode/BC_ResultPoint.h",
         "xfa/src/fxbarcode/BC_TwoDimWriter.h",
         "xfa/src/fxbarcode/BC_UtilCodingConvert.h",
         "xfa/src/fxbarcode/BC_UtilRSS.h",
         "xfa/src/fxbarcode/BC_Writer.h",
-        "xfa/src/fxbarcode/barcode.h",
         "xfa/src/fxbarcode/utils.h",
         "xfa/src/fxfa/src/app/xfa_checksum.cpp",
         "xfa/src/fxfa/src/app/xfa_checksum.h",
         "xfa/src/fxfa/src/app/xfa_ffapp.cpp",
         "xfa/src/fxfa/src/app/xfa_ffapp.h",
         "xfa/src/fxfa/src/app/xfa_ffbarcode.cpp",
         "xfa/src/fxfa/src/app/xfa_ffbarcode.h",
         "xfa/src/fxfa/src/app/xfa_ffcheckbutton.cpp",
         "xfa/src/fxfa/src/app/xfa_ffcheckbutton.h",
         "xfa/src/fxfa/src/app/xfa_ffchoicelist.cpp",
@@ skipping 173 matching lines @@
           "sources": [],
         }],
         ["OS == 'mac'", {
           "configurations": {},
           "sources": [],
         }],
       ]
     }
   ]
 }