Rename is_chromeos in chrome/src.

components/policy/proto/BUILD.gn

Index: components/policy/proto/BUILD.gn
diff --git a/components/policy/proto/BUILD.gn b/components/policy/proto/BUILD.gn
index 3b6a7b26fa57d155e52f40eac65b23482cb82c0b..fdd4ad5aeba3b264839ccd7fef78762b0218d7fa 100644
--- a/components/policy/proto/BUILD.gn
+++ b/components/policy/proto/BUILD.gn
@@ -2,6 +2,7 @@
 # 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
@@ -23,7 +24,7 @@ proto_library("proto_internal") {
   if (!is_android && !is_ios) {
     sources += [ "chrome_extension_policy.proto" ]
   }
-  if (is_chromeos) {
+  if (use_cros_fe) {
     sources += [ "device_management_local.proto" ]
   }