Rename is_chromeos in chrome/src.

ui/app_list/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/ui.gni")
 import("//testing/test.gni")
 
 component("app_list") {
   sources = [
     "app_list_constants.cc",
@@ skipping 209 matching lines @@
 
   deps = [
     ":app_list",
     "//base",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/resources",
   ]
 }
 
-if (is_linux && !is_chromeos) {
+if (is_linux && !use_cros_fe) {
   # TODO(GYP): Figure out which of these work and are needed on other platforms.
   if (toolkit_views) {
     executable("app_list_demo") {
       testonly = true
 
       sources = [
         "demo/app_list_demo_views.cc",
       ]
 
       deps = [
@@ skipping 98 matching lines @@
       "cocoa/app_list_view_controller_unittest.mm",
       "cocoa/app_list_window_controller_unittest.mm",
       "cocoa/apps_grid_controller_unittest.mm",
       "cocoa/apps_search_box_controller_unittest.mm",
       "cocoa/apps_search_results_controller_unittest.mm",
       "cocoa/test/apps_grid_controller_test_helper.h",
       "cocoa/test/apps_grid_controller_test_helper.mm",
     ]
   }
 }