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

sync/notifier/sync_notifier.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.
 //
 // Interface to the sync notifier, which is an object that receives
 // notifications when updates are available for a set of sync types.
 // All the observers are notified when such an event happens.
 
 #ifndef SYNC_NOTIFIER_SYNC_NOTIFIER_H_
 #define SYNC_NOTIFIER_SYNC_NOTIFIER_H_
@@ skipping 13 matching lines @@
   virtual void AddObserver(SyncNotifierObserver* observer) = 0;
   virtual void RemoveObserver(SyncNotifierObserver* observer) = 0;
 
   // SetUniqueId must be called once, before any call to
   // UpdateCredentials.  |unique_id| should be a non-empty globally
   // unique string.
   virtual void SetUniqueId(const std::string& unique_id) = 0;
 
   // SetState must be called once, before any call to
   // UpdateCredentials.  |state| may be empty.
-  virtual void SetState(const std::string& state) = 0;
+  // Deprecated in favour of InvalidationStateTracker persistence.
+  virtual void SetStateDeprecated(const std::string& state) = 0;
 
   // The observers won't be notified of any notifications until
   // UpdateCredentials is called at least once. It can be called more than
   // once.
   virtual void UpdateCredentials(
       const std::string& email, const std::string& token) = 0;
 
   virtual void UpdateEnabledTypes(
       syncable::ModelTypeSet enabled_types) = 0;
 
   // This is here only to support the old p2p notification implementation,
   // which is still used by sync integration tests.
   // TODO(akalin): Remove this once we move the integration tests off p2p
   // notifications.
   virtual void SendNotification(
       syncable::ModelTypeSet changed_types) = 0;
 };
 }  // namespace sync_notifier
 
 #endif  // SYNC_NOTIFIER_SYNC_NOTIFIER_H_
-