Rename is_chromeos in chrome/src.

extensions/shell/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("//extensions/shell/app_shell.gni")
 
 # Technically, this directory should not depend on files from src/chrome, but
 # that's where the VERSION file is. This  should probably all be moved to
 # src/build.
 import("//chrome/version.gni")
@@ skipping 58 matching lines @@
 
   if (use_aura) {
     deps += [ "//ui/wm" ]
 
     aura_sources = rebase_path(app_shell_gypi_values.app_shell_lib_sources_aura,
                                ".",
                                "//extensions/shell")
     sources += aura_sources
   }
 
-  if (is_chromeos) {
+  if (use_cros_fe) {
     deps += [
       "//chromeos",
       "//ui/chromeos:ui_chromeos",
       "//ui/display",
     ]
     chromeos_sources =
         rebase_path(app_shell_gypi_values.app_shell_lib_sources_chromeos,
                     ".",
                     "//extensions/shell")
     sources += chromeos_sources
@@ skipping 35 matching lines @@
       "//components/nacl:nacl_switches",
       "//components/nacl/renderer/plugin:nacl_trusted_plugin",
     ]
 
     if (is_linux) {
       deps += [ "//components/nacl:nacl_helper" ]
     }
   }
 }
 
-if (!(is_chromeos && !use_ozone)) {
+if (!(use_cros_fe && !use_ozone)) {
   executable("app_shell") {
     # testonly because :app_shell_lib is testonly. See :app_shell_lib comment.
     testonly = true
     sources = rebase_path(app_shell_gypi_values.app_shell_sources,
                           ".",
                           "//extensions/shell")
     deps = [
       ":app_shell_lib",
       "//extensions:shell_and_test_pak",
     ]
@@ skipping 50 matching lines @@
   if (use_aura) {
     deps += [ "//ui/aura:test_support" ]
 
     aura_sources =
         rebase_path(app_shell_gypi_values.app_shell_unittests_sources_aura,
                     ".",
                     "//extensions/shell")
     sources += aura_sources
   }
 
-  if (is_chromeos) {
+  if (use_cros_fe) {
     deps += [ "//chromeos:test_support_without_gmock" ]
 
     chromeos_sources =
         rebase_path(app_shell_gypi_values.app_shell_unittests_sources_chromeos,
                     ".",
                     "//extensions/shell")
     sources += chromeos_sources
   }
 
   # TODO(GYP): Enable this when //components/nacl GN is done.
   if (false) {
     if (use_nacl) {
       nacl_sources =
           rebase_path(app_shell_gypi_values.app_shell_unittests_sources_nacl,
                       ".",
                       "//extensions/shell")
       sources += nacl_sources
     }
   }
 
   if (is_win) {
     deps += [ "//base/allocator" ]
   }
 }
 
 process_version("version_header") {
   template_file = "common/version.h.in"
   output = "$target_gen_dir/common/version.h"
 }