Standardize usage of virtual/override/final in components/

components/keyed_service/content/browser_context_keyed_service_factory.h

Index: components/keyed_service/content/browser_context_keyed_service_factory.h
diff --git a/components/keyed_service/content/browser_context_keyed_service_factory.h b/components/keyed_service/content/browser_context_keyed_service_factory.h
index 8ad8e136d5c1d6f3f8bef348dd2ffe8fb3212652..29637d4c82e6d92b9fc44e29cc8a856d2a1dda64 100644
--- a/components/keyed_service/content/browser_context_keyed_service_factory.h
+++ b/components/keyed_service/content/browser_context_keyed_service_factory.h
@@ -56,7 +56,7 @@ class KEYED_SERVICE_EXPORT BrowserContextKeyedServiceFactory
   //   {}
   BrowserContextKeyedServiceFactory(const char* name,
                                     BrowserContextDependencyManager* manager);
-  virtual ~BrowserContextKeyedServiceFactory();
+  ~BrowserContextKeyedServiceFactory() override;
 
   // Common implementation that maps |context| to some service object. Deals
   // with incognito contexts per subclass instructions with
@@ -91,15 +91,12 @@ class KEYED_SERVICE_EXPORT BrowserContextKeyedServiceFactory
   // Secondly, BrowserContextDestroyed() is called on every ServiceFactory
   // and the default implementation removes it from |mapping_| and deletes
   // the pointer.
-  virtual void BrowserContextShutdown(content::BrowserContext* context)
-      override;
-  virtual void BrowserContextDestroyed(content::BrowserContext* context)
-      override;
-
-  virtual void SetEmptyTestingFactory(content::BrowserContext* context)
-      override;
-  virtual bool HasTestingFactory(content::BrowserContext* context) override;
-  virtual void CreateServiceNow(content::BrowserContext* context) override;
+  void BrowserContextShutdown(content::BrowserContext* context) override;
+  void BrowserContextDestroyed(content::BrowserContext* context) override;
+
+  void SetEmptyTestingFactory(content::BrowserContext* context) override;
+  bool HasTestingFactory(content::BrowserContext* context) override;
+  void CreateServiceNow(content::BrowserContext* context) override;
 
  private:
   friend class BrowserContextDependencyManager;