chromeos: Remove old status-area related code.

chrome/browser/chromeos/status/clock_updater.cc

-// 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.
-
-#include "chrome/browser/chromeos/status/clock_updater.h"
-
-#include "chrome/browser/chromeos/status/clock_menu_button.h"
-#include "chrome/browser/chromeos/system/timezone_settings.h"
-#include "chromeos/dbus/dbus_thread_manager.h"
-
-ClockUpdater::ClockUpdater(ClockMenuButton* button)
-    : button_(button) {
-  chromeos::system::TimezoneSettings::GetInstance()->AddObserver(this);
-  chromeos::DBusThreadManager::Get()->GetPowerManagerClient()->
-      AddObserver(this);
-}
-
-ClockUpdater::~ClockUpdater() {
-  chromeos::system::TimezoneSettings::GetInstance()->RemoveObserver(this);
-  chromeos::DBusThreadManager::Get()->GetPowerManagerClient()->
-      RemoveObserver(this);
-}
-
-void ClockUpdater::TimezoneChanged(const icu::TimeZone& timezone) {
-  button_->UpdateText();
-}
-
-void ClockUpdater::SystemResumed() {
-  button_->UpdateText();
-}