chromeos: Move files in //ash/common to //ash

ash/common/system/chromeos/system_clock_observer.h

-// Copyright 2013 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.
-
-#ifndef ASH_COMMON_SYSTEM_CHROMEOS_SYSTEM_CLOCK_OBSERVER_H_
-#define ASH_COMMON_SYSTEM_CHROMEOS_SYSTEM_CLOCK_OBSERVER_H_
-
-#include "base/macros.h"
-#include "chromeos/dbus/system_clock_client.h"
-#include "chromeos/settings/timezone_settings.h"
-
-namespace ash {
-
-class SystemClockObserver
-    : public chromeos::SystemClockClient::Observer,
-      public chromeos::system::TimezoneSettings::Observer {
- public:
-  SystemClockObserver();
-  ~SystemClockObserver() override;
-
-  // chromeos::SystemClockClient::Observer
-  void SystemClockUpdated() override;
-  void SystemClockCanSetTimeChanged(bool can_set_time) override;
-
-  // chromeos::system::TimezoneSettings::Observer
-  void TimezoneChanged(const icu::TimeZone& timezone) override;
-
-  bool can_set_time() { return can_set_time_; }
-
- private:
-  bool can_set_time_;
-
-  DISALLOW_COPY_AND_ASSIGN(SystemClockObserver);
-};
-
-}  // namespace ash
-
-#endif  // ASH_COMMON_SYSTEM_CHROMEOS_SYSTEM_CLOCK_OBSERVER_H_