[DI] Remove dead service_container checks

Author: ro0NL

Dumper/GraphvizDumper.php

@@ -192,8 +192,7 @@ private function findNodes()
             }
 
             if (!$container->hasDefinition($id)) {
-                $class = get_class('service_container' === $id ? $this->container : $container->get($id));
-                $nodes[$id] = array('class' => str_replace('\\', '\\\\', $class), 'attributes' => $this->options['node.instance']);
+                $nodes[$id] = array('class' => str_replace('\\', '\\\\', get_class($container->get($id))), 'attributes' => $this->options['node.instance']);
             }
         }