Eliminate ash::internal namespace

ash/system/chromeos/system_clock_observer.cc

 // 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.
 
 #include "ash/system/chromeos/system_clock_observer.h"
 
 #include "ash/shell.h"
 #include "ash/system/tray/system_tray_notifier.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 
 namespace ash {
-namespace internal {
 
 SystemClockObserver::SystemClockObserver() {
   chromeos::DBusThreadManager::Get()->GetSystemClockClient()
       ->AddObserver(this);
   chromeos::system::TimezoneSettings::GetInstance()->AddObserver(this);
 }
 
 SystemClockObserver::~SystemClockObserver() {
   chromeos::DBusThreadManager::Get()->GetSystemClockClient()
       ->RemoveObserver(this);
   chromeos::system::TimezoneSettings::GetInstance()->RemoveObserver(this);
 }
 
 void SystemClockObserver::SystemClockUpdated() {
   Shell::GetInstance()->system_tray_notifier()
       ->NotifySystemClockTimeUpdated();
 }
 
 void SystemClockObserver::TimezoneChanged(const icu::TimeZone& timezone) {
   Shell::GetInstance()->system_tray_notifier()->NotifyRefreshClock();
 }
 
-}  // namespace internal
 }  // namespace ash