Fix GN build

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 1473 matching lines @@
     "core/fxcrt/fx_extension_unittest.cpp",
     "core/fxcrt/fx_system_unittest.cpp",
     "fpdfsdk/fpdfdoc_unittest.cpp",
   ]
   deps = [
     ":pdfium",
     ":test_support",
     "//testing/gtest",
     "//testing/gtest:gtest_main",
   ]
+  include_dirs = []
   if (pdf_enable_xfa) {
     sources += [
       "xfa/fxbarcode/pdf417/BC_PDF417HighLevelEncoder_unittest.cpp",
       "xfa/fxfa/parser/xfa_utils_imp_unittest.cpp",
     ]
   }
   if (pdf_enable_v8) {
     sources += [
       "fpdfsdk/javascript/public_methods_unittest.cpp",
     ]
@@ skipping 48 matching lines @@
       "//v8:v8_libplatform",
     ]
     include_dirs += [
       "//v8",
       "//v8/include",
     ]
     configs += [ "//v8:external_startup_data" ]
   }
   configs += [ ":pdfium_config" ]
 }