Pref service: delete old implementation

services/preferences/public/cpp/pref_client_store.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 SERVICES_PREFERENCES_PUBLIC_CPP_PREFS_CLIENT_STORE_H_
-#define SERVICES_PREFERENCES_PUBLIC_CPP_PREFS_CLIENT_STORE_H_
-
-#include <set>
-
-#include "base/macros.h"
-#include "components/prefs/value_map_pref_store.h"
-#include "mojo/public/cpp/bindings/binding.h"
-#include "services/preferences/public/interfaces/preferences.mojom.h"
-
-namespace preferences {
-
-class PrefClientStoreTest;
-
-// An implementation of PrefStore which uses prefs::mojom::PreferenceManager as
-// the backing of the preferences.
-//
-// PrefClientStore caches the values locally to provide synchronous access.
-// The cache is empty until the first notification of OnPreferencesChanged is
-// received from the prefs::mojom::PreferenceManager. Upon recieving an initial
-// OnPreferencesChanged initialization will be considered as completed, and any
-// PrefStore::Observer will be notified of OnInitializationCompleted.
-//
-// Currently this does not support RemoveValue.
-class PrefClientStore : public ValueMapPrefStore,
-                        public prefs::mojom::PreferencesServiceClient {
- public:
-  explicit PrefClientStore(
-      prefs::mojom::PreferencesServiceFactoryPtr pref_factory_ptr);
-
-  // Adds a set of |keys| which PrefClientStore will handle. Begins listening
-  // for changes to these from |prefs_service_|.
-  void Subscribe(const std::set<std::string>& keys);
-
-  // PrefStore:
-  bool GetValue(const std::string& key,
-                const base::Value** value) const override;
-
-  // ValueMapPrefStore:
-  void SetValue(const std::string& key,
-                std::unique_ptr<base::Value> value,
-                uint32_t flags) override;
-  void RemoveValue(const std::string& key, uint32_t flags) override;
-  bool GetMutableValue(const std::string& key, base::Value** value) override;
-  void ReportValueChanged(const std::string& key, uint32_t flags) override;
-  void SetValueSilently(const std::string& key,
-                        std::unique_ptr<base::Value> value,
-                        uint32_t flags) override;
-
- protected:
-  // base::RefCounted<PrefStore>:
-  ~PrefClientStore() override;
-
- private:
-  friend class PrefClientStoreTest;
-
-  // Notifies |prefs_service_| of the change in |key| - |value| pair.
-  void SetValueOnPreferenceManager(const std::string& key,
-                                   base::Value const& value);
-
-  // prefs::mojom::PreferencesServiceClient:
-  void OnPreferencesChanged(
-      std::unique_ptr<base::DictionaryValue> preferences) override;
-
-  mojo::Binding<prefs::mojom::PreferencesServiceClient> prefs_binding_;
-  prefs::mojom::PreferencesServiceFactoryPtr pref_factory_ptr_;
-  prefs::mojom::PreferencesServicePtr prefs_service_ptr_;
-
-  std::set<std::string> keys_;
-
-  // True upon the first OnPreferencesChanged received after Init.
-  bool initialized_;
-
-  DISALLOW_COPY_AND_ASSIGN(PrefClientStore);
-};
-
-}  // namespace preferences
-#endif  // SERVICES_PREFERENCES_PUBLIC_CPP_PREFS_CLIENT_STORE_H_