[Sync] Componentize local_device_info_provider_impl and test

chrome/browser/sync/glue/local_device_info_provider_impl.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_IMPL_H_
-#define CHROME_BROWSER_SYNC_GLUE_LOCAL_DEVICE_INFO_PROVIDER_IMPL_H_
-
-#include "base/memory/weak_ptr.h"
-#include "components/sync_driver/device_info.h"
-#include "components/sync_driver/local_device_info_provider.h"
-
-namespace browser_sync {
-
-class LocalDeviceInfoProviderImpl
-    : public sync_driver::LocalDeviceInfoProvider {
- public:
-  LocalDeviceInfoProviderImpl();
-  ~LocalDeviceInfoProviderImpl() override;
-
-  // LocalDeviceInfoProvider implementation.
-  const sync_driver::DeviceInfo* GetLocalDeviceInfo() const override;
-  std::string GetSyncUserAgent() const override;
-  std::string GetLocalSyncCacheGUID() const override;
-  void Initialize(const std::string& cache_guid,
-                  const std::string& signin_scoped_device_id) override;
-  scoped_ptr<Subscription> RegisterOnInitializedCallback(
-      const base::Closure& callback) override;
-
- private:
-
-  void InitializeContinuation(const std::string& guid,
-                              const std::string& signin_scoped_device_id,
-                              const std::string& session_name);
-
-  std::string cache_guid_;
-  scoped_ptr<sync_driver::DeviceInfo> local_device_info_;
-  base::CallbackList<void(void)> callback_list_;
-  base::WeakPtrFactory<LocalDeviceInfoProviderImpl> weak_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(LocalDeviceInfoProviderImpl);
-};
-
-}  // namespace browser_sync
-
-#endif  // CHROME_BROWSER_SYNC_GLUE_LOCAL_DEVICE_INFO_PROVIDER_IMPL_H_