Rename is_chromeos in chrome/src.

chrome/app/resources/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.
 
 import("//build/config/chrome_build.gni")
 import("//tools/grit/grit_rule.gni")
 
 # GYP version: chrome/chrome_resources.gyp:chrome_strings
 #              (generate_locale_settings action)
 grit("locale_settings") {
@@ skipping 58 matching lines @@
     "locale_settings_zh-TW.pak",
   ]
 }
 
 # GYP version: chrome/chrome_resources.gyp:platform_locale_settings
 grit("platform_locale_settings") {
   if (is_win) {
     source = "locale_settings_win.grd"
   } else if (is_mac || is_ios) {
     source = "locale_settings_mac.grd"
-  } else if (is_chromeos) {
+  } else if (use_cros_fe) {
     if (is_chrome_branded) {
       source = "locale_settings_google_chromeos.grd"
     } else {
       source = "locale_settings_chromiumos.grd"
     }
   } else if (is_posix) {
     # All other posix systems just use the Linux one.
     source = "locale_settings_linux.grd"
   }
 
@@ skipping 50 matching lines @@
     "platform_locale_settings_th.pak",
     "platform_locale_settings_tr.pak",
     "platform_locale_settings_uk.pak",
     "platform_locale_settings_vi.pak",
     "platform_locale_settings_zh-CN.pak",
     "platform_locale_settings_zh-TW.pak",
   ]
 
   output_dir = "$root_gen_dir/chrome"
 }