chromeos: Remove old status-area related code.

chrome/browser/chromeos/status/clock_updater.h

-// Copyright (c) 2012 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 CHROME_BROWSER_CHROMEOS_STATUS_CLOCK_UPDATER_H_
-#define CHROME_BROWSER_CHROMEOS_STATUS_CLOCK_UPDATER_H_
-#pragma once
-
-#include "chrome/browser/chromeos/system/timezone_settings.h"
-#include "chromeos/dbus/power_manager_client.h"
-
-class ClockMenuButton;
-
-// ClockUpdater is responsible for updating a ClockMenuButton when:
-// 1. the timezone changes.
-// 2. the system resumes from sleep.
-class ClockUpdater : public chromeos::system::TimezoneSettings::Observer,
-                     public chromeos::PowerManagerClient::Observer {
- public:
-  explicit ClockUpdater(ClockMenuButton* button);
-  virtual ~ClockUpdater();
-
-  // TimezoneSettings::Observer overrides:
-  virtual void TimezoneChanged(const icu::TimeZone& timezone) OVERRIDE;
-
-  // PowerManagerClient::Observer overrides:
-  virtual void SystemResumed() OVERRIDE;
-
- private:
-  ClockMenuButton* button_;
-
-  DISALLOW_COPY_AND_ASSIGN(ClockUpdater);
-};
-
-#endif  // CHROME_BROWSER_CHROMEOS_STATUS_CLOCK_UPDATER_H_