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

chrome/browser/download/download_service_factory.h

Index: chrome/browser/download/download_service_factory.h
diff --git a/chrome/browser/download/download_service_factory.h b/chrome/browser/download/download_service_factory.h
index 9cf79c475db476f231785ccc288822359c9ef120..8958fe1224791254377bf765f319b6764a98476c 100644
--- a/chrome/browser/download/download_service_factory.h
+++ b/chrome/browser/download/download_service_factory.h
@@ -24,16 +24,16 @@ class DownloadServiceFactory : public BrowserContextKeyedServiceFactory {
 
  protected:
   // BrowserContextKeyedServiceFactory:
-  virtual KeyedService* BuildServiceInstanceFor(
+  KeyedService* BuildServiceInstanceFor(
       content::BrowserContext* profile) const override;
-  virtual content::BrowserContext* GetBrowserContextToUse(
+  content::BrowserContext* GetBrowserContextToUse(
       content::BrowserContext* context) const override;
 
  private:
   friend struct DefaultSingletonTraits<DownloadServiceFactory>;
 
   DownloadServiceFactory();
-  virtual ~DownloadServiceFactory();
+  ~DownloadServiceFactory() override;
 };
 
 #endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_SERVICE_FACTORY_H_