ash: Use mojo LocaleNotificationController interface.

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")
 import("//ui/base/ui_features.gni")
 
 assert(use_aura)
@@ skipping 302 matching lines @@
     "common/system/date/date_view.cc",
     "common/system/date/date_view.h",
     "common/system/date/tray_date.cc",
     "common/system/date/tray_date.h",
     "common/system/ime/ime_observer.h",
     "common/system/ime/tray_ime_chromeos.cc",
     "common/system/ime/tray_ime_chromeos.h",
     "common/system/keyboard_brightness_control_delegate.h",
     "common/system/locale/locale_notification_controller.cc",
     "common/system/locale/locale_notification_controller.h",
-    "common/system/locale/locale_observer.h",
     "common/system/networking_config_delegate.cc",
     "common/system/networking_config_delegate.h",
     "common/system/overview/overview_button_tray.cc",
     "common/system/overview/overview_button_tray.h",
     "common/system/status_area_layout_manager.cc",
     "common/system/status_area_layout_manager.h",
     "common/system/status_area_widget.cc",
     "common/system/status_area_widget.h",
     "common/system/status_area_widget_delegate.cc",
     "common/system/status_area_widget_delegate.h",
@@ skipping 1141 matching lines @@
   if (is_win) {
     configs -= [ "//build/config/win:console" ]
     configs += [ "//build/config/win:windowed" ]
     deps += [ "//sandbox" ]
   }
 
   if (is_chromeos) {
     deps += [ "//device/bluetooth" ]
   }
 }