sync: migrate invalidation state from syncable::Directory to InvalidationStorage

sync/notifier/chrome_invalidation_client.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.
 //
 // A simple wrapper around invalidation::InvalidationClient that
 // handles all the startup/shutdown details and hookups.
 
 #ifndef SYNC_NOTIFIER_CHROME_INVALIDATION_CLIENT_H_
 #define SYNC_NOTIFIER_CHROME_INVALIDATION_CLIENT_H_
 #pragma once
@@ skipping 50 matching lines @@
   virtual ~ChromeInvalidationClient();
 
   // Does not take ownership of |listener| or |state_writer|.
   // |invalidation_state_tracker| must be initialized.
   void Start(
       const std::string& client_id, const std::string& client_info,
       const std::string& state,
       const InvalidationVersionMap& initial_max_invalidation_versions,
       const browser_sync::WeakHandle<InvalidationStateTracker>&
           invalidation_state_tracker,
-      Listener* listener,
-      StateWriter* state_writer);
+      Listener* listener);
 
   void UpdateCredentials(const std::string& email, const std::string& token);
 
   // Register the sync types that we're interested in getting
   // notifications for.  May be called at any time.
   void RegisterTypes(syncable::ModelTypeSet types);
 
   virtual void WriteState(const std::string& state) OVERRIDE;
 
   // invalidation::InvalidationListener implementation.
@@ skipping 34 matching lines @@
 
   void EmitInvalidation(
       syncable::ModelTypeSet types, const std::string& payload);
 
   base::NonThreadSafe non_thread_safe_;
   ChromeSystemResources chrome_system_resources_;
   InvalidationVersionMap max_invalidation_versions_;
   browser_sync::WeakHandle<InvalidationStateTracker>
       invalidation_state_tracker_;
   Listener* listener_;
-  StateWriter* state_writer_;
   scoped_ptr<invalidation::InvalidationClient> invalidation_client_;
   scoped_ptr<RegistrationManager> registration_manager_;
   // Stored to pass to |registration_manager_| on start.
   syncable::ModelTypeSet registered_types_;
   bool ticl_ready_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeInvalidationClient);
 };
 
 }  // namespace sync_notifier
 
 #endif  // SYNC_NOTIFIER_CHROME_INVALIDATION_CLIENT_H_