[DeviceService] Move //device/time_zone_monitor to //services/device

device/time_zone_monitor/public/interfaces/time_zone_monitor.mojom

-// Copyright 2016 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.
-
-module device.mojom;
-
-interface TimeZoneMonitor {
-  // Add a client that will get notified on time zone changes. No throttling is
-  // employed, as time zone changes are infrequent enough that there is no
-  // realistic risk of flooding.
-  AddClient(TimeZoneMonitorClient client);
-};
-
-interface TimeZoneMonitorClient {
-  // Called on a time zone change. |tz_info| is the new time zone ID.
-  OnTimeZoneChange(string tz_info);
-};