Pref service: delete old implementation

chrome/browser/prefs/preferences_service.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 CHROME_BROWSER_PREFS_PREFERENCES_SERVICE_H_
-#define CHROME_BROWSER_PREFS_PREFERENCES_SERVICE_H_
-
-#include <memory>
-
-#include "base/macros.h"
-#include "services/preferences/public/interfaces/preferences.mojom.h"
-
-namespace test {
-class PreferencesServiceTest;
-}
-
-class PrefChangeRegistrar;
-class PrefService;
-class Profile;
-
-// Implementation of prefs::mojom::PreferencesService that accepts a single
-// prefs::mojom::PreferencesServiceClient.
-//
-// After calling AddObserver PreferencesService will begin observing changes to
-// the requested preferences, notifying the client of all changes.
-class PreferencesService : public prefs::mojom::PreferencesService {
- public:
-  PreferencesService(prefs::mojom::PreferencesServiceClientPtr client,
-                     Profile* profile);
-  ~PreferencesService() override;
-
- private:
-  friend class test::PreferencesServiceTest;
-
-  // PrefChangeRegistrar::NamedChangeCallback:
-  void PreferenceChanged(const std::string& preference_name);
-
-  // mojom::PreferencesService:
-  void SetPreferences(
-      std::unique_ptr<base::DictionaryValue> preferences) override;
-  void Subscribe(const std::vector<std::string>& preferences) override;
-
-  // Tracks the desired preferences, and listens for updates.
-  std::unique_ptr<PrefChangeRegistrar> preferences_change_registrar_;
-  prefs::mojom::PreferencesServiceClientPtr client_;
-  PrefService* service_;
-
-  // Used to prevent notifying |client_| of changes caused by it calling
-  // SetPreferences.
-  bool setting_preferences_;
-
-  DISALLOW_COPY_AND_ASSIGN(PreferencesService);
-};
-
-#endif  // CHROME_BROWSER_PREFS_PREFERENCES_SERVICE_H_