Rename is_chromeos in chrome/src.

apps/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")
 
 static_library("apps") {
   sources = [
     "app_lifetime_monitor.cc",
@@ skipping 26 matching lines @@
   configs += [ "//build/config/compiler:wexit_time_destructors" ]
 
   deps = [
     "//chrome/app/theme:theme_resources",
     "//chrome/browser/extensions",
     "//chrome/common/extensions/api:api",
     "//components/web_modal",
     "//skia",
   ]
 
-  if (is_chromeos) {
+  if (use_cros_fe) {
     #deps += [ "browser_chromeos" ]  TODO(GYP)
   }
 
   if (!enable_extensions) {
     # When extensions are disabled, only the sizer file below is included.
     deps -= [
       "//chrome/browser/extensions",
       "//chrome/common/extensions/api:api",
     ]
     sources = []
   }
 
   if (toolkit_views) {
     sources += [
       "ui/views/app_window_frame_view.cc",
       "ui/views/app_window_frame_view.h",
     ]
     deps += [
       "//ui/strings",
       "//ui/views",
     ]
     if (enable_extensions) {
       deps += [ "//extensions/browser" ]
     }
   }
 
   # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
   configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
 }