Standardize usage of virtual/override/final in components/

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/basictypes.h"
 #include "base/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);
-  virtual ~TestingPrefServiceSyncable();
+  ~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_