Revert of Sync: Refactoring of DEVICE_INFO syncable type - Part 1

chrome/browser/sync/glue/local_device_info_provider.h

-// Copyright 2014 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_SYNC_GLUE_LOCAL_DEVICE_INFO_PROVIDER_H_
-#define CHROME_BROWSER_SYNC_GLUE_LOCAL_DEVICE_INFO_PROVIDER_H_
-
-#include <string>
-#include "base/callback_list.h"
-
-namespace browser_sync {
-
-class DeviceInfo;
-
-// Interface for providing sync specific informaiton about the
-// local device.
-class LocalDeviceInfoProvider {
- public:
-  typedef base::CallbackList<void(void)>::Subscription Subscription;
-
-  virtual ~LocalDeviceInfoProvider() {}
-
-  // Returns sync's representation of the local device info;
-  // NULL if the device info is unavailable.
-  // The returned object is fully owned by LocalDeviceInfoProvider (must not
-  // be freed by the caller). It remains valid until LocalDeviceInfoProvider
-  // is destroyed.
-  virtual const DeviceInfo* GetLocalDeviceInfo() const = 0;
-
-  // Returns a GUID string used for creation of the machine tag for
-  // this local session; an empty sting if LocalDeviceInfoProvider hasn't been
-  // initialized yet.
-  virtual std::string GetLocalSyncCacheGUID() const = 0;
-
-  // Starts initializing local device info.
-  virtual void Initialize(const std::string& cache_guid) = 0;
-
-  // Registers a callback to be called when local device info becomes available.
-  // The callback will remain registered until the
-  // returned Subscription is destroyed, which must occur before the
-  // CallbackList is destroyed.
-  virtual scoped_ptr<Subscription> RegisterOnInitializedCallback(
-      const base::Closure& callback) = 0;
-};
-
-}  // namespace browser_sync
-
-#endif  // CHROME_BROWSER_SYNC_GLUE_LOCAL_DEVICE_INFO_PROVIDER_H_