Rename is_chromeos in chrome/src.

components/ownership/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/crypto.gni")
 import("//build/config/features.gni")
 
-if (is_chromeos) {
+if (use_cros_fe) {
   component("ownership") {
     sources = [
       "mock_owner_key_util.cc",
       "mock_owner_key_util.h",
       "owner_key_util.cc",
       "owner_key_util.h",
       "owner_key_util_impl.cc",
       "owner_key_util_impl.h",
       "owner_settings_service.cc",
       "owner_settings_service.h",
@@ skipping 27 matching lines @@
     ]
 
     configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
 
     deps = [
       ":ownership",
       "//testing/gtest",
     ]
   }
 }