Remove function that is no longer used.

src/Illuminate/Foundation/Support/Providers/RouteServiceProvider.php

@@ -69,25 +69,6 @@ protected function loadRoutes()
         $this->app->call([$this, 'map']);
     }
 
-    /**
-     * Load the standard routes file for the application.
-     *
-     * @param  string  $path
-     * @return mixed
-     */
-    protected function loadRoutesFrom($path)
-    {
-        $router = $this->app->make(Router::class);
-
-        if (is_null($this->namespace)) {
-            return require $path;
-        }
-
-        $router->group(['namespace' => $this->namespace], function (Router $router) use ($path) {
-            require $path;
-        });
-    }
-
     /**
      * Register the service provider.
      *