Standardize usage of virtual/override/final in components/

components/pref_registry/pref_registry_syncable.h

 // Copyright (c) 2012 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_PREF_REGISTRY_PREF_REGISTRY_SYNCABLE_H_
 #define COMPONENTS_PREF_REGISTRY_PREF_REGISTRY_SYNCABLE_H_
 
 #include <set>
 #include <string>
 
@@ skipping 96 matching lines @@
                          PrefSyncStatus sync_status);
   void RegisterUint64Pref(const char* path,
                           uint64 default_value,
                           PrefSyncStatus sync_status);
 
   // Returns a new PrefRegistrySyncable that uses the same defaults
   // store.
   scoped_refptr<PrefRegistrySyncable> ForkForIncognito();
 
  private:
-  virtual ~PrefRegistrySyncable();
+  ~PrefRegistrySyncable() override;
 
   void RegisterSyncablePreference(const char* path,
                                   base::Value* default_value,
                                   PrefSyncStatus sync_status);
 
   SyncableRegistrationCallback callback_;
 
   // Contains the names of all registered preferences that are syncable.
   PrefToStatus syncable_preferences_;
 
   DISALLOW_COPY_AND_ASSIGN(PrefRegistrySyncable);
 };
 
 }  // namespace user_prefs
 
 #endif  // COMPONENTS_PREF_REGISTRY_PREF_REGISTRY_SYNCABLE_H_