Rename is_chromeos in chrome/src.

device/media_transfer_protocol/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("//third_party/protobuf/proto_library.gni")
 
 # GYP version: device/media_transfer_protocol/media_transfer_protocol.gyp:mtp_file_entry_proto
 proto_library("mtp_file_entry_proto") {
   sources = [
     "//third_party/cros_system_api/dbus/mtp_file_entry.proto",
@@ skipping 20 matching lines @@
 
   public_deps = [
     ":mtp_file_entry_proto",
     ":mtp_storage_info_proto",
     "//base",
   ]
   deps = [
     "//dbus",
   ]
 
-  if (is_chromeos) {
+  if (is_chromeos_ui) {
     deps += [ "//chromeos" ]
   }
 }