Rename is_chromeos in chrome/src.

ash/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("//build/config/ui.gni")
 import("//testing/test.gni")
 
 gypi_values = exec_script("//build/gypi_to_gn.py",
                           [ rebase_path("ash.gyp") ],
@@ skipping 74 matching lines @@
     ]
   }
 
   if (use_ozone) {
     deps += [
       "//ui/events/ozone:events_ozone",
       "//ui/ozone",
     ]
   }
 
-  if (is_chromeos) {
+  if (use_cros_fe) {
     deps += [
       "//device/bluetooth",
       "//ui/display",
       "//ui/display/util",
       "//chromeos",
       "//chromeos:power_manager_proto",
       "//third_party/qcms",
       "//ui/chromeos/resources",
       "//ui/chromeos/strings",
       "//ui/chromeos:ui_chromeos",
@@ skipping 202 matching lines @@
     "//ui/message_center:test_support",
     "//ui/resources",
     "//ui/views",
     "//ui/views:test_support",
     "//ui/views/controls/webview:test_support",
     "//ui/web_dialogs:test_support",
     "//ui/wm",
     "//url",
   ]
 
-  if (!is_chromeos) {
+  if (!use_cros_fe) {
     sources -= [
       # TODO(zork): fix this test to build on Windows. See: crosbug.com/26906
       "focus_cycler_unittest.cc",
 
       # All tests for multiple displays: not supported on Windows Ash.
       "wm/drag_window_resizer_unittest.cc",
 
       # Accelerometer is only available on Chrome OS.
       "wm/maximize_mode/maximize_mode_controller_unittest.cc",
 
       # Can't resize on Windows Ash. http://crbug.com/165962
       "autoclick/autoclick_unittest.cc",
       "magnifier/magnification_controller_unittest.cc",
       "sticky_keys/sticky_keys_overlay_unittest.cc",
       "system/tray/media_security/multi_profile_media_tray_item_unittest.cc",
       "virtual_keyboard_controller_unittest.cc",
       "wm/workspace/workspace_window_resizer_unittest.cc",
     ]
     sources += [
       #'<(SHARED_INTERMEDIATE_DIR)/ui/resources/ui_unscaled_resources.rc',  TODO(GYP)
     ]
   }
 
   configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
 
   if (!use_x11) {
     sources -= [ "host/ash_window_tree_host_x11_unittest.cc" ]
   }
-  if (is_chromeos) {
+  if (use_cros_fe) {
     sources += [ "first_run/first_run_helper_unittest.cc" ]
     deps += [
       "//device/bluetooth",
       "//ui/display",
       "//ui/display:test_util",
       "//ui/display/types",
       "//chromeos:power_manager_proto",
       "//chromeos:test_support_without_gmock",
     ]
   } else {
     sources -= [
       "accelerators/magnifier_key_scroller_unittest.cc",
       "accelerators/spoken_feedback_toggler_unittest.cc",
       "display/resolution_notification_controller_unittest.cc",
       "touch/touchscreen_util_unittest.cc",
     ]
   }
 
-  if (!use_x11 || !is_chromeos) {
+  if (!use_x11 || !use_cros_fe) {
     sources -= [ "touch/touch_transformer_controller_unittest.cc" ]
   }
 
   # TODO(GYP) is this necessary?
   #['OS=="linux" and component=="shared_library" and use_allocator!="none"', {
   # ldflags = "-rdynamic"
 
-  if (!is_chromeos) {
+  if (!use_cros_fe) {
     sources -= [ "sticky_keys/sticky_keys_unittest.cc" ]
   }
 }
 
 executable("ash_shell") {
   testonly = true
   sources = [
     "shell/shell_main.cc",
   ]
 
   deps = [
     ":ash_shell_lib",
     "//components/user_manager",
   ]
 
   if (is_win) {
     configs -= [ "//build/config/win:console" ]
     configs += [ "//build/config/win:windowed" ]
     deps += [ "//sandbox" ]
   }
 
-  if (is_chromeos) {
+  if (use_cros_fe) {
     deps += [ "//device/bluetooth" ]
   }
 }
 # When adding support for isolates, please have a look at run-time dependencies
 # in the ash_unittests_run target in ash.gyp.