Revert 154457 - Switch from SignedSettings to DeviceSettingsService.

chrome/browser/chromeos/settings/device_settings_cache.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_SETTINGS_DEVICE_SETTINGS_CACHE_H_
-#define CHROME_BROWSER_CHROMEOS_SETTINGS_DEVICE_SETTINGS_CACHE_H_
-
-namespace enterprise_management {
-class PolicyData;
-}
-
-class PrefService;
-
-namespace chromeos {
-
-// There is need (metrics at OOBE stage) to store settings (that normally would
-// go into DeviceSettings storage) before owner has been assigned (hence no key
-// is available). This set of functions serves as a transient storage in that
-// case.
-namespace device_settings_cache {
-// Registers required pref section.
-void RegisterPrefs(PrefService* local_state);
-
-// Stores a new policy blob inside the cache stored in |local_state|.
-bool Store(const enterprise_management::PolicyData &policy,
-           PrefService* local_state);
-
-// Retrieves the policy blob from the cache stored in |local_state|.
-bool Retrieve(enterprise_management::PolicyData *policy,
-              PrefService* local_state);
-
-// Call this after owner has been assigned to persist settings into
-// DeviceSettings storage.
-void Finalize(PrefService* local_state);
-}  // namespace device_settings_cache
-
-}  // namespace chromeos
-
-#endif  // CHROME_BROWSER_CHROMEOS_SETTINGS_DEVICE_SETTINGS_CACHE_H_