Standardize usage of virtual/override/final in chrome/browser/profiles/

chrome/browser/profiles/startup_task_runner_service_factory.h

Index: chrome/browser/profiles/startup_task_runner_service_factory.h
diff --git a/chrome/browser/profiles/startup_task_runner_service_factory.h b/chrome/browser/profiles/startup_task_runner_service_factory.h
index beddade37c536e6fc29aeb2cfd21ae494e8b9504..49abdf26d1d4d832dcf629e8f50a8e217b380204 100644
--- a/chrome/browser/profiles/startup_task_runner_service_factory.h
+++ b/chrome/browser/profiles/startup_task_runner_service_factory.h
@@ -28,10 +28,10 @@ class StartupTaskRunnerServiceFactory
   friend struct DefaultSingletonTraits<StartupTaskRunnerServiceFactory>;
 
   StartupTaskRunnerServiceFactory();
-  virtual ~StartupTaskRunnerServiceFactory();
+  ~StartupTaskRunnerServiceFactory() override;
 
   // BrowserContextKeyedServiceFactory:
-  virtual KeyedService* BuildServiceInstanceFor(
+  KeyedService* BuildServiceInstanceFor(
       content::BrowserContext* profile) const override;
 
   DISALLOW_COPY_AND_ASSIGN(StartupTaskRunnerServiceFactory);