remove interface implementation

initRuntime() was removed.

Controller/HelperController.php

@@ -303,7 +303,6 @@ class HelperController
         // render the widget
         // todo : fix this, the twig environment variable is not set inside the extension ...
         $extension = $this->twig->getExtension('sonata_admin');
-        $extension->initRuntime($this->twig);
 
         $content = $extension->renderListElement($this->twig, $rootObject, $fieldDescription);
 

Twig/Extension/SonataAdminExtension.php

@@ -23,7 +23,7 @@ use Sonata\AdminBundle\Exception\NoValueException;
  *
  * @author  Thomas Rabaix <thomas.rabaix@sonata-project.org>
  */
-class SonataAdminExtension extends \Twig_Extension implements \Twig_Extension_InitRuntimeInterface
+class SonataAdminExtension extends \Twig_Extension
 {
     /**
      * @var Pool