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

apps/saved_files_service.h

Index: apps/saved_files_service.h
diff --git a/apps/saved_files_service.h b/apps/saved_files_service.h
index aa7909be66ed6aab720d1309677d5c2830aede07..d696c79da274338c25ec42e249f0ab156c3edec1 100644
--- a/apps/saved_files_service.h
+++ b/apps/saved_files_service.h
@@ -111,7 +111,7 @@ class SavedFilesService : public KeyedService,
   // content::NotificationObserver.
   virtual void Observe(int type,
                        const content::NotificationSource& source,
-                       const content::NotificationDetails& details) OVERRIDE;
+                       const content::NotificationDetails& details) override;
 
   // Returns the SavedFiles for |extension_id| or NULL if one does not exist.
   SavedFiles* Get(const std::string& extension_id) const;