Rename is_chromeos in chrome/src.

components/policy/proto/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("//third_party/protobuf/proto_library.gni")
 
 # The proto files need to be a component to avoid duplicate symbols the way the
 # dependency structure is currently. Since proto_library generates a source
 # set, here we link the result into a component.
 component("proto") {
   public_deps = [
     ":proto_internal",
   ]
 }
 
 proto_library("proto_internal") {
   visibility = [ ":proto" ]
 
   sources = [
     "device_management_backend.proto",
     "policy_signing_key.proto",
   ]
   if (!is_android && !is_ios) {
     sources += [ "chrome_extension_policy.proto" ]
   }
-  if (is_chromeos) {
+  if (use_cros_fe) {
     sources += [ "device_management_local.proto" ]
   }
 
   proto_out_dir = "policy/proto"
   cc_generator_options = "dllexport_decl=POLICY_PROTO_EXPORT:"
   cc_include = "components/policy/policy_proto_export.h"
   defines = [ "POLICY_PROTO_COMPILATION" ]
 }