Reading List create protobuf store

ios/chrome/browser/reading_list/reading_list_model_factory.h

 // Copyright 2016 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 IOS_CHROME_BROWSER_READING_LIST_READING_LIST_MODEL_FACTORY_H_
 #define IOS_CHROME_BROWSER_READING_LIST_READING_LIST_MODEL_FACTORY_H_
 
 #include <memory>
 
 #include "components/keyed_service/ios/browser_state_keyed_service_factory.h"
 
 namespace base {
 template <typename T>
 struct DefaultSingletonTraits;
 }  // namespace base
 
 class ReadingListModel;
+class ReadingListStore;
 
 namespace ios {
 class ChromeBrowserState;
 }
 
 // Singleton that owns the ReadingListModel and associates it with
 // ios::ChromeBrowserState.
 class ReadingListModelFactory : public BrowserStateKeyedServiceFactory {
  public:
   static ReadingListModel* GetForBrowserState(
       ios::ChromeBrowserState* browser_state);
   static ReadingListModel* GetForBrowserStateIfExists(
       ios::ChromeBrowserState* browser_state);
   static ReadingListModelFactory* GetInstance();
+  static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
 
  private:
   friend struct base::DefaultSingletonTraits<ReadingListModelFactory>;
 
   ReadingListModelFactory();
   ~ReadingListModelFactory() override;
 
   // BrowserStateKeyedServiceFactory implementation.
   std::unique_ptr<KeyedService> BuildServiceInstanceFor(
       web::BrowserState* context) const override;
   web::BrowserState* GetBrowserStateToUse(
       web::BrowserState* context) const override;
 
   DISALLOW_COPY_AND_ASSIGN(ReadingListModelFactory);
 };
 
 #endif  // IOS_CHROME_BROWSER_READING_LIST_READING_LIST_MODEL_FACTORY_H_