Prepare to abstract PersistedData by making it part of the configurator.

components/update_client/update_engine.h

 // Copyright 2015 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 COMPONENTS_UPDATE_CLIENT_UPDATE_ENGINE_H_
 #define COMPONENTS_UPDATE_CLIENT_UPDATE_ENGINE_H_
 
 #include <iterator>
 #include <list>
 #include <map>
@@ skipping 85 matching lines @@
   base::ThreadChecker thread_checker_;
 
   scoped_refptr<Configurator> config_;
 
   UpdateChecker::Factory update_checker_factory_;
   CrxDownloader::Factory crx_downloader_factory_;
 
   // TODO(sorin): refactor as a ref counted class.
   PingManager* ping_manager_;  // Not owned by this class.
 
-  std::unique_ptr<PersistedData> metadata_;
-
   // Called when CRX state changes occur.
   const NotifyObserversCallback notify_observers_callback_;
 
   // Contains the contexts associated with each update in progress.
   UpdateContexts update_contexts_;
 
   // Implements a rate limiting mechanism for background update checks. Has the
   // effect of rejecting the update call if the update call occurs before
   // a certain time, which is negotiated with the server as part of the
   // update protocol. See the comments for X-Retry-After header.
@@ skipping 61 matching lines @@
   // is handling the next component in the queue.
   base::TimeDelta next_update_delay;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(UpdateContext);
 };
 
 }  // namespace update_client
 
 #endif  // COMPONENTS_UPDATE_CLIENT_UPDATE_ENGINE_H_