Switch Preferences to use Factory

chrome/browser/prefs/preferences_manager.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_MANAGER_H_
 #define CHROME_BROWSER_PREFS_PREFERENCES_MANAGER_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "services/preferences/public/interfaces/preferences.mojom.h"
 
 namespace test {
 class PreferencesManagerTest;
 }
 
 class PrefChangeRegistrar;
 class PrefService;
 class Profile;
 
 // Implementation of prefs::mojom::PreferencesManager that accepts a single
 // prefs::mojom::PreferencesObserver.
 //
 // After calling AddObserver PreferencesManager will begin observing changes to
 // the requested preferences, notifying the client of all changes.
 class PreferencesManager : public prefs::mojom::PreferencesManager {
  public:
-  explicit PreferencesManager(Profile* profile);
+  PreferencesManager(prefs::mojom::PreferencesObserverPtr client,
+                     Profile* profile);
   ~PreferencesManager() override;
 
  private:
   friend class test::PreferencesManagerTest;
 
   // PrefChangeRegistrar::NamedChangeCallback:
   void PreferenceChanged(const std::string& preference_name);
 
   // mojom::PreferencesManager:
-  void AddObserver(prefs::mojom::PreferencesObserverPtr client) override;
   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::PreferencesObserverPtr client_;
   PrefService* service_;
 
   // Used to prevent notifying |client_| of changes caused by it calling
   // SetPreferences.
   bool setting_preferences_;
 
   DISALLOW_COPY_AND_ASSIGN(PreferencesManager);
 };
 
 #endif  // CHROME_BROWSER_PREFS_PREFERENCES_MANAGER_H_