Pref service: Merge connectors and send a PrefRegistry in Connect().

services/preferences/persistent_pref_store_factory.h

 // Copyright 2017 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 SERVICES_PREFERENCES_PERSISTENT_PREF_STORE_FACTORY_H_
 #define SERVICES_PREFERENCES_PERSISTENT_PREF_STORE_FACTORY_H_
 
 #include <memory>
 
 #include "services/preferences/public/interfaces/preferences.mojom.h"
 
 namespace base {
 class SequencedWorkerPool;
 }
 
 namespace prefs {
 class PersistentPrefStoreImpl;
 
 // Create a new mojom::PersistentPrefStore impl that runs on |worker_pool|
 // configured by |configuration|.
 std::unique_ptr<PersistentPrefStoreImpl> CreatePersistentPrefStore(
     mojom::PersistentPrefStoreConfigurationPtr configuration,
-    base::SequencedWorkerPool* worker_pool);
+    base::SequencedWorkerPool* worker_pool,
+    base::Closure on_initialized);
 
 }  // namespace prefs
 
 #endif  // SERVICES_PREFERENCES_PERSISTENT_PREF_STORE_FACTORY_H_