[2.7][SecurityBundle] Remove SecurityContext from Compile

Remove the deprecated SecurityContext from the list of classes to compile into `classes.map` and `classes.php`.

Author: zanbaldwin

DependencyInjection/SecurityExtension.php

@@ -100,7 +100,6 @@ public function load(array $configs, ContainerBuilder $container)
         // add some required classes for compilation
         $this->addClassesToCompile(array(
             'Symfony\\Component\\Security\\Http\\Firewall',
-            'Symfony\\Component\\Security\\Core\\SecurityContext',
             'Symfony\\Component\\Security\\Core\\User\\UserProviderInterface',
             'Symfony\\Component\\Security\\Core\\Authentication\\AuthenticationProviderManager',
             'Symfony\\Component\\Security\\Core\\Authentication\\Token\\Storage\\TokenStorage',