mash: Allow a subset of D-Bus clients to be created in DBusThreadManager

ash/common/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/common/system/chromeos/system_clock_observer.h"
 
+#include "ash/common/dbus_thread_manager_ash.h"
 #include "ash/common/system/tray/system_tray_notifier.h"
 #include "ash/common/wm_shell.h"
-#include "chromeos/dbus/dbus_thread_manager.h"
+// #include "chromeos/dbus/dbus_thread_manager.h"
+#include "chromeos/dbus/system_clock_client.h"
 
 namespace ash {
 
 SystemClockObserver::SystemClockObserver() {
-  chromeos::DBusThreadManager::Get()->GetSystemClockClient()->AddObserver(this);
+  DBusThreadManagerAsh::Get()->GetSystemClockClient()->AddObserver(this);
   chromeos::system::TimezoneSettings::GetInstance()->AddObserver(this);
   can_set_time_ =
-      chromeos::DBusThreadManager::Get()->GetSystemClockClient()->CanSetTime();
+      DBusThreadManagerAsh::Get()->GetSystemClockClient()->CanSetTime();
 }
 
 SystemClockObserver::~SystemClockObserver() {
-  chromeos::DBusThreadManager::Get()->GetSystemClockClient()->RemoveObserver(
-      this);
+  DBusThreadManagerAsh::Get()->GetSystemClockClient()->RemoveObserver(this);
   chromeos::system::TimezoneSettings::GetInstance()->RemoveObserver(this);
 }
 
 void SystemClockObserver::SystemClockUpdated() {
   WmShell::Get()->system_tray_notifier()->NotifySystemClockTimeUpdated();
 }
 
 void SystemClockObserver::SystemClockCanSetTimeChanged(bool can_set_time) {
   can_set_time_ = can_set_time;
   WmShell::Get()->system_tray_notifier()->NotifySystemClockCanSetTimeChanged(
       can_set_time_);
 }
 
 void SystemClockObserver::TimezoneChanged(const icu::TimeZone& timezone) {
   WmShell::Get()->system_tray_notifier()->NotifyRefreshClock();
 }
 
 }  // namespace ash