Standardize usage of virtual/override/final in components/

components/invalidation/invalidator_storage.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_INVALIDATION_INVALIDATOR_STORAGE_H_
 #define COMPONENTS_INVALIDATION_INVALIDATOR_STORAGE_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/threading/thread_checker.h"
 #include "components/invalidation/invalidation_state_tracker.h"
 
 class PrefRegistrySimple;
 class PrefService;
 
 namespace user_prefs {
 class PrefRegistrySyncable;
 }
 
 namespace invalidation {
 
 // Wraps PrefService in an InvalidationStateTracker to allow SyncNotifiers
 // to use PrefService as persistence for invalidation state. It is not thread
 // safe, and lives on the UI thread.
 class InvalidatorStorage : public syncer::InvalidationStateTracker {
  public:
   // |pref_service| may not be NULL and must outlive |this|.
   explicit InvalidatorStorage(PrefService* pref_service);
-  virtual ~InvalidatorStorage();
+  ~InvalidatorStorage() override;
 
   // Register prefs to be used by per-Profile instances of this class which
   // store invalidation state in Profile prefs.
   static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
 
   // Register prefs to be used by a device-global instance of this class which
   // stores invalidation state in local state. This is used on Chrome OS only.
   static void RegisterPrefs(PrefRegistrySimple* registry);
 
   // InvalidationStateTracker implementation.
-  virtual void ClearAndSetNewClientId(const std::string& client_id) override;
-  virtual std::string GetInvalidatorClientId() const override;
-  virtual void SetBootstrapData(const std::string& data) override;
-  virtual std::string GetBootstrapData() const override;
-  virtual void SetSavedInvalidations(
+  void ClearAndSetNewClientId(const std::string& client_id) override;
+  std::string GetInvalidatorClientId() const override;
+  void SetBootstrapData(const std::string& data) override;
+  std::string GetBootstrapData() const override;
+  void SetSavedInvalidations(
       const syncer::UnackedInvalidationsMap& map) override;
-  virtual syncer::UnackedInvalidationsMap GetSavedInvalidations()
-      const override;
-  virtual void Clear() override;
+  syncer::UnackedInvalidationsMap GetSavedInvalidations() const override;
+  void Clear() override;
 
  private:
   base::ThreadChecker thread_checker_;
 
   PrefService* const pref_service_;
 
   DISALLOW_COPY_AND_ASSIGN(InvalidatorStorage);
 };
 
 }  // namespace invalidation
 
 #endif  // COMPONENTS_INVALIDATION_INVALIDATOR_STORAGE_H_