[TimeZoneMonitor] Decouple //content/browser/time_zone_monitor* to //device/.

content/browser/time_zone_monitor_chromeos.cc

-// 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.
-
-#include "content/browser/time_zone_monitor.h"
-
-#include "base/macros.h"
-#include "chromeos/settings/timezone_settings.h"
-
-namespace content {
-
-class TimeZoneMonitorChromeOS
-    : public TimeZoneMonitor,
-      public chromeos::system::TimezoneSettings::Observer {
- public:
-  TimeZoneMonitorChromeOS() : TimeZoneMonitor() {
-    chromeos::system::TimezoneSettings::GetInstance()->AddObserver(this);
-  }
-
-  ~TimeZoneMonitorChromeOS() override {
-    chromeos::system::TimezoneSettings::GetInstance()->RemoveObserver(this);
-  }
-
-  // chromeos::system::TimezoneSettings::Observer implementation.
-  void TimezoneChanged(const icu::TimeZone& time_zone) override {
-    NotifyClients();
-  }
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(TimeZoneMonitorChromeOS);
-};
-
-// static
-std::unique_ptr<TimeZoneMonitor> TimeZoneMonitor::Create(
-    scoped_refptr<base::SequencedTaskRunner> file_task_runner) {
-  return std::unique_ptr<TimeZoneMonitor>(new TimeZoneMonitorChromeOS());
-}
-
-}  // namespace content