XFA: Fix GN build under chromium checkout.

third_party/BUILD.gn

 # Copyright 2014 PDFium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 group("third_party") {
   deps = [
     ":bigint",
     ":freetype",
     ":safemath",
   ]
 }
 
 static_library("bigint") {
+  configs -= [ "//build/config/compiler:chromium_code" ]
+  configs += [
+      "//third_party/pdfium:pdfium_config",
+      "//build/config/compiler:no_chromium_code",
+  ]
   sources = [
     "bigint/BigInteger.hh",
     "bigint/BigIntegerLibrary.hh",
     "bigint/BigIntegerUtils.hh",
     "bigint/BigUnsigned.hh",
     "bigint/NumberlikeArray.hh",
     "bigint/BigUnsignedInABase.hh",
     "bigint/BigInteger.cc",
     "bigint/BigIntegerUtils.cc",
     "bigint/BigUnsigned.cc",
     "bigint/BigUnsignedInABase.cc",
   ]
 }
 
 static_library("freetype") {
-  defines = [
-    "FT2_BUILD_LIBRARY",
-  ]
-  include_dirs = [
-    "freetype/include",
+  configs -= [ "//build/config/compiler:chromium_code" ]
+  configs += [
+      "//third_party/pdfium:pdfium_config",
+      "//build/config/compiler:no_chromium_code",
   ]
   sources = [
     "freetype/include/freetype.h",
     "freetype/include/ft2build.h",
     "freetype/include/ftmm.h",
     "freetype/include/ftotval.h",
     "freetype/include/ftoutln.h",
     "freetype/include/tttables.h",
     "freetype/include/internal/ftobjs.h",
     "freetype/include/internal/ftstream.h",
@@ skipping 14 matching lines @@
     "freetype/src/raster/raster.c",
     "freetype/src/sfnt/sfnt.c",
     "freetype/src/smooth/smooth.c",
     "freetype/src/truetype/truetype.c",
     "freetype/src/type1/type1.c",
     "freetype/src/cid/type1cid.c",
   ]
 }
 
 component("safemath") {
+  configs -= [ "//build/config/compiler:chromium_code" ]
+  configs += [
+      "//third_party/pdfium:pdfium_config",
+      "//build/config/compiler:no_chromium_code",
+  ]
   sources = [
     "logging.h",
     "macros.h",
     "template_util.h",
     "numerics/safe_conversions.h",
     "numerics/safe_conversions_impl.h",
     "numerics/safe_math.h",
     "numerics/safe_math_impl.h",
   ]
 }