Reverting this as it breaks (at least) the Windows Aura build.

chrome/browser/chromeos/status/timezone_clock_updater.h

Index: chrome/browser/chromeos/status/timezone_clock_updater.h
===================================================================
--- chrome/browser/chromeos/status/timezone_clock_updater.h	(revision 110804)
+++ chrome/browser/chromeos/status/timezone_clock_updater.h	(working copy)
@@ -1,30 +0,0 @@
-// Copyright (c) 2011 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_TIMEZONE_CLOCK_UPDATER_H_
-#define CHROME_BROWSER_CHROMEOS_STATUS_TIMEZONE_CLOCK_UPDATER_H_
-#pragma once
-
-#include "chrome/browser/chromeos/system/timezone_settings.h"
-
-class ClockMenuButton;
-
-// TimezoneClockUpdater is responsible for updating a ClockMenuButton when the
-// timezone changes.
-class TimezoneClockUpdater
-    : public chromeos::system::TimezoneSettings::Observer {
- public:
-  explicit TimezoneClockUpdater(ClockMenuButton* button);
-  virtual ~TimezoneClockUpdater();
-
-  // TimezoneSettings::Observer overrides:
-  virtual void TimezoneChanged(const icu::TimeZone& timezone) OVERRIDE;
-
- private:
-  ClockMenuButton* button_;
-
-  DISALLOW_COPY_AND_ASSIGN(TimezoneClockUpdater);
-};
-
-#endif  // CHROME_BROWSER_CHROMEOS_STATUS_TIMEZONE_CLOCK_UPDATER_H_