Replace OVERRIDE and FINAL with override and final in src/apps

apps/app_load_service.h

Index: apps/app_load_service.h
diff --git a/apps/app_load_service.h b/apps/app_load_service.h
index 041b1ab5c5a362b4c5dca9db1b77653c55f05a48..566672ecbfef4d29944b05ec399008c60c0bfbb0 100644
--- a/apps/app_load_service.h
+++ b/apps/app_load_service.h
@@ -67,13 +67,13 @@ class AppLoadService : public KeyedService,
   // content::NotificationObserver.
   virtual void Observe(int type,
                        const content::NotificationSource& source,
-                       const content::NotificationDetails& details) OVERRIDE;
+                       const content::NotificationDetails& details) override;
 
   // extensions::ExtensionRegistryObserver.
   virtual void OnExtensionUnloaded(
       content::BrowserContext* browser_context,
       const extensions::Extension* extension,
-      extensions::UnloadedExtensionInfo::Reason reason) OVERRIDE;
+      extensions::UnloadedExtensionInfo::Reason reason) override;
 
   bool WasUnloadedForReload(
       const extensions::ExtensionId& extension_id,