Mark hunspell as not chromium code in the GN build.

BUILD.gn

 # Copyright 2014 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.
 
 config("hunspell_config") {
   defines = [
     "HUNSPELL_STATIC",
     "HUNSPELL_CHROME_CLIENT",
     "USE_HUNSPELL",
   ]
@@ skipping 33 matching lines @@
     "src/hunspell/replist.cxx",
     "src/hunspell/replist.hxx",
     "src/hunspell/suggestmgr.cxx",
     "src/hunspell/suggestmgr.hxx",
     "src/hunspell/utf_info.hxx",
     "src/hunspell/w_char.hxx",
     "src/parsers/textparser.cxx",
     "src/parsers/textparser.hxx",
   ]
 
+  configs -= [ "//build/config/compiler:chromium_code" ]
+  configs += [ "//build/config/compiler:no_chromium_code" ]
   direct_dependent_configs = [
     ":hunspell_config",
   ]
 
   defines = [
     "OPENOFFICEORG",
   ]
 
   deps = [
     "//base",
@@ skipping 28 matching lines @@
   if (is_clang) {
     cflags += [
       # affentry.cxx has one `while ((p = nextchar(p)));` parsing loop.
       "-Wno-empty-body",
       # affentry.hxx has NULL as default parameter for a FLAG in two
       # places.
       "-Wno-null-conversion",
     ]
   }
 }