Standardize usage of virtual/override/final in components/

components/invalidation/invalidation_notifier.h

Index: components/invalidation/invalidation_notifier.h
diff --git a/components/invalidation/invalidation_notifier.h b/components/invalidation/invalidation_notifier.h
index bf7147d9fef741fde999fa7ab70a0bc1c8ee2d49..1b0bbda73ed1298f627b6262b82604d9f0d5a8df 100644
--- a/components/invalidation/invalidation_notifier.h
+++ b/components/invalidation/invalidation_notifier.h
@@ -50,24 +50,22 @@ class INVALIDATION_EXPORT_PRIVATE InvalidationNotifier
           invalidation_state_tracker_task_runner,
       const std::string& client_info);
 
-  virtual ~InvalidationNotifier();
+  ~InvalidationNotifier() override;
 
   // Invalidator implementation.
-  virtual void RegisterHandler(InvalidationHandler* handler) override;
-  virtual void UpdateRegisteredIds(InvalidationHandler* handler,
-                                   const ObjectIdSet& ids) override;
-  virtual void UnregisterHandler(InvalidationHandler* handler) override;
-  virtual InvalidatorState GetInvalidatorState() const override;
-  virtual void UpdateCredentials(
-      const std::string& email, const std::string& token) override;
-  virtual void RequestDetailedStatus(
-      base::Callback<void(const base::DictionaryValue&)> callback) const
-      override;
+  void RegisterHandler(InvalidationHandler* handler) override;
+  void UpdateRegisteredIds(InvalidationHandler* handler,
+                           const ObjectIdSet& ids) override;
+  void UnregisterHandler(InvalidationHandler* handler) override;
+  InvalidatorState GetInvalidatorState() const override;
+  void UpdateCredentials(const std::string& email,
+                         const std::string& token) override;
+  void RequestDetailedStatus(base::Callback<void(const base::DictionaryValue&)>
+                                 callback) const override;
 
   // SyncInvalidationListener::Delegate implementation.
-  virtual void OnInvalidate(
-      const ObjectIdInvalidationMap& invalidation_map) override;
-  virtual void OnInvalidatorStateChange(InvalidatorState state) override;
+  void OnInvalidate(const ObjectIdInvalidationMap& invalidation_map) override;
+  void OnInvalidatorStateChange(InvalidatorState state) override;
 
  private:
   // We start off in the STOPPED state.  When we get our initial