Rename is_chromeos in chrome/src.

components/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/features.gni")
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 import("//tools/grit/repack.gni")
 
 # Collection of all components. You wouldn't link to this, but this is rather
@@ skipping 134 matching lines @@
     ]
   }
 
   if (!enable_configuration_policy) {
     deps -= [ "//components/policy" ]
   }
 
   if (!is_win && !is_mac) {
     deps -= [ "//components/wifi" ]
   }
-  if (!is_chromeos) {
+  if (!use_cros_fe) {
     deps -= [
       "//components/pairing",
       "//components/wifi_sync",
     ]
   }
 
-  if (!is_chromeos || !enable_extensions) {
+  if (!use_cros_fe || !enable_extensions) {
     deps -= [ "//components/chrome_apps" ]
   }
 
   if (is_ios) {
     deps -= [
       "//components/history/content/browser",
       "//components/keyed_service/content",
     ]
   }
 
@@ skipping 191 matching lines @@
     deps -= [
       "//components/gcm_driver:unit_tests",
       "//components/gcm_driver/instance_id:unit_tests",
     ]
   }
 
   if (!is_android && !is_ios) {
     deps += [ "//components/proximity_auth:unit_tests" ]
   }
 
-  if (is_chromeos) {
+  if (use_cros_fe) {
     deps += [ "//components/ownership:unit_tests" ]
   }
 
   # TODO(GYP) need this target.
   #'breakpad/app/crash_keys_win_unittest.cc',
 
   # Precache tests need these defines.
   #configs += [ "//components/precache/core:precache_config" ]
 
   if (toolkit_views) {
@@ skipping 122 matching lines @@
 
   deps = [
     "//base",
     "//base/test:test_support_perf",
     "//testing/gtest",
     "//testing/perf",
     "//content/test:test_support",
     "//components/visitedlink/browser",
   ]
 }