Remove duplicated user_prefs::TestingPrefServiceSyncable

components/pref_registry/testing_pref_service_syncable.h

-// Copyright 2014 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_PERF_REGISTRY_TESTING_PREF_SERVICE_SYNCABLE_H_
-#define COMPONENTS_PERF_REGISTRY_TESTING_PREF_SERVICE_SYNCABLE_H_
-
-#include "base/macros.h"
-#include "components/prefs/testing_pref_service.h"
-
-namespace user_prefs {
-
-class PrefRegistrySyncable;
-
-// Test version of PrefServiceSyncable.
-class TestingPrefServiceSyncable
-    : public TestingPrefServiceBase<PrefService, PrefRegistrySyncable> {
- public:
-  TestingPrefServiceSyncable();
-  TestingPrefServiceSyncable(TestingPrefStore* managed_prefs,
-                             TestingPrefStore* user_prefs,
-                             TestingPrefStore* recommended_prefs,
-                             PrefRegistrySyncable* pref_registry,
-                             PrefNotifierImpl* pref_notifier);
-  ~TestingPrefServiceSyncable() override;
-
-  // This is provided as a convenience; on a production PrefService
-  // you would do all registrations before constructing it, passing it
-  // a PrefRegistry via its constructor (or via e.g. PrefServiceFactory).
-  PrefRegistrySyncable* registry();
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(TestingPrefServiceSyncable);
-};
-
-}  // namespace user_prefs
-
-#endif  // COMPONENTS_PERF_REGISTRY_TESTING_PREF_SERVICE_SYNCABLE_H_