Rename is_chromeos in chrome/src.

chrome/browser/extensions/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/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 
 assert(enable_extensions)
 
@@ skipping 67 matching lines @@
     "//ui/base",
     "//ui/base/ime",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/resources",
     "//ui/strings",
     "//url",
     "//storage/browser",
   ]
 
-  if (is_chromeos) {
+  if (use_cros_fe) {
     sources +=
         rebase_path(gypi_values.chrome_browser_extensions_chromeos_sources,
                     ".",
                     "//chrome")
     sources -= [ "api/music_manager_private/device_id_linux.cc" ]
     configs += [ "//build/config/linux:dbus" ]
     deps += [
       "//third_party/libevent",
       "//third_party/protobuf:protobuf_lite",
       "//chromeos/ime:gencode",
@@ skipping 63 matching lines @@
   if (use_brlapi) {
     deps += [ "//build/config/linux:libbrlapi" ]
     sources += rebase_path(gypi_values.chrome_browser_extensions_brlapi_sources,
                            ".",
                            "//chrome")
   } else {
     sources += [ "api/braille_display_private/braille_controller_stub.cc" ]
   }
 
   # chromeos uses its own global_shortcut_listener, _x11 is not necessary.
-  if (is_chromeos || !use_x11) {
+  if (use_cros_fe || !use_x11) {
     sources -= [
       "global_shortcut_listener_x11.cc",
       "global_shortcut_listener_x11.h",
     ]
   }
 
   if (is_win || is_mac) {
     deps += [ "//components/wifi" ]
     sources += rebase_path(
             gypi_values.chrome_browser_extensions_networking_private_sources_winmac,
             ".",
             "//chrome")
   }
 
   if (is_win) {
     deps += [
       "//third_party/iaccessible2",
       "//third_party/isimpledom",
     ]
-  } else if (use_aura && !is_chromeos) {
+  } else if (use_aura && !use_cros_fe) {
     sources += [
       "display_info_provider_aura.cc",
       "display_info_provider_aura.h",
     ]
   }
 
   if (enable_app_list) {
     sources +=
         rebase_path(gypi_values.chrome_browser_extensions_app_list_sources,
                     ".",
                     "//chrome")
   }
 
-  if (is_chromeos && use_ozone) {
+  if (use_cros_fe && use_ozone) {
     sources -= [ "global_shortcut_listener_chromeos.cc" ]
   }
   if (!use_ozone) {
     sources -= [ "global_shortcut_listener_ozone.cc" ]
   }
 }