Remove include only barcode.h and IWYU.

BUILD.gn

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build_overrides/v8.gni")
 import("//testing/test.gni")
 import("pdfium.gni")
 
 config("pdfium_config") {
   cflags = []
@@ skipping 1036 matching lines @@
       "xfa/src/fxbarcode/BC_ResultPoint.h",
       "xfa/src/fxbarcode/BC_TwoDimWriter.cpp",
       "xfa/src/fxbarcode/BC_TwoDimWriter.h",
       "xfa/src/fxbarcode/BC_UtilCodingConvert.cpp",
       "xfa/src/fxbarcode/BC_UtilCodingConvert.h",
       "xfa/src/fxbarcode/BC_UtilRSS.cpp",
       "xfa/src/fxbarcode/BC_UtilRSS.h",
       "xfa/src/fxbarcode/BC_Utils.cpp",
       "xfa/src/fxbarcode/BC_Writer.cpp",
       "xfa/src/fxbarcode/BC_Writer.h",
-      "xfa/src/fxbarcode/barcode.h",
       "xfa/src/fxbarcode/common/BC_CommonBitArray.cpp",
       "xfa/src/fxbarcode/common/BC_CommonBitArray.h",
       "xfa/src/fxbarcode/common/BC_CommonBitMatrix.cpp",
       "xfa/src/fxbarcode/common/BC_CommonBitMatrix.h",
       "xfa/src/fxbarcode/common/BC_CommonBitSource.cpp",
       "xfa/src/fxbarcode/common/BC_CommonBitSource.h",
       "xfa/src/fxbarcode/common/BC_CommonByteArray.cpp",
       "xfa/src/fxbarcode/common/BC_CommonByteArray.h",
       "xfa/src/fxbarcode/common/BC_CommonByteMatrix.cpp",
       "xfa/src/fxbarcode/common/BC_CommonByteMatrix.h",
@@ skipping 446 matching lines @@
       "//v8:v8_libplatform",
     ]
     include_dirs += [
       "//v8",
       "//v8/include",
     ]
     configs += [ "//v8:external_startup_data" ]
   }
   configs += [ ":pdfium_config" ]
 }