fixes #1779

src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php

@@ -136,7 +136,6 @@ class FrameworkExtension extends Extension
             'Symfony\\Bundle\\FrameworkBundle\\EventListener\\RouterListener',
             'Symfony\\Bundle\\FrameworkBundle\\Controller\\ControllerNameParser',
             'Symfony\\Bundle\\FrameworkBundle\\Controller\\ControllerResolver',
-            'Symfony\\Bundle\\FrameworkBundle\\Controller\\Controller',
             'Symfony\\Bundle\\FrameworkBundle\\ContainerAwareEventDispatcher',
             'Symfony\\Bundle\\FrameworkBundle\\HttpKernel',
         ));