WIP: Pref service: use the incognito support from Chrome

components/sync_preferences/pref_service_syncable.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.
 
 #ifndef COMPONENTS_SYNC_PREFERENCES_PREF_SERVICE_SYNCABLE_H_
 #define COMPONENTS_SYNC_PREFERENCES_PREF_SERVICE_SYNCABLE_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 26 matching lines @@
       PrefNotifierImpl* pref_notifier,
       PrefValueStore* pref_value_store,
       PersistentPrefStore* user_prefs,
       user_prefs::PrefRegistrySyncable* pref_registry,
       const PrefModelAssociatorClient* pref_model_associato_client,
       base::Callback<void(PersistentPrefStore::PrefReadError)>
           read_error_callback,
       bool async);
   ~PrefServiceSyncable() override;
 
-  // Creates an incognito copy of the pref service that shares most pref stores
-  // but uses a fresh non-persistent overlay for the user pref store and an
-  // individual extension pref store (to cache the effective extension prefs for
-  // incognito windows). |overlay_pref_names| is a list of preference names
-  // whose changes will not be persisted by the returned incognito pref service.
-  PrefServiceSyncable* CreateIncognitoPrefService(
-      PrefStore* incognito_extension_pref_store,
-      const std::vector<const char*>& overlay_pref_names);
-
   // Returns true if preferences state has synchronized with the remote
   // preferences. If true is returned it can be assumed the local preferences
   // has applied changes from the remote preferences. The two may not be
   // identical if a change is in flight (from either side).
   //
   // TODO(albertb): Given that we now support priority preferences, callers of
   // this method are likely better off making the preferences they care about
   // into priority preferences and calling IsPrioritySyncing().
   bool IsSyncing();
 
@@ skipping 47 matching lines @@
   PrefModelAssociator priority_pref_sync_associator_;
 
   base::ObserverList<PrefServiceSyncableObserver> observer_list_;
 
   DISALLOW_COPY_AND_ASSIGN(PrefServiceSyncable);
 };
 
 }  // namespace sync_preferences
 
 #endif  // COMPONENTS_SYNC_PREFERENCES_PREF_SERVICE_SYNCABLE_H_