update DI to handle change in config and another provider

src/Symfony/Bundle/SecurityBundle/DependencyInjection/SecurityExtension.php

@@ -110,13 +110,21 @@ class SecurityExtension extends Extension
         $loader = new XmlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config'));
         $loader->load('security_acl.xml');
 
-        if (isset($config['connection'])) {
-            $container->setAlias('security.acl.dbal.connection', sprintf('doctrine.dbal.%s_connection', $config['connection']));
-        }
-
         if (isset($config['cache']['id'])) {
             $container->setAlias('security.acl.cache', $config['cache']['id']);
         }
+        $container->getDefinition('security.acl.voter.basic_permissions')->addArgument($config['voter']['allow_if_object_identity_unavailable']);
+
+        if (isset($config['provider'])) {
+            $container->setAlias('security.acl.provider', $config['provider']);
+            return;
+        }
+
+        $loader->load('security_acl_dbal.xml');
+
+        if (isset($config['connection'])) {
+            $container->setAlias('security.acl.dbal.connection', sprintf('doctrine.dbal.%s_connection', $config['connection']));
+        }
         $container->getDefinition('security.acl.cache.doctrine')->addArgument($config['cache']['prefix']);
 
         $container->setParameter('security.acl.dbal.class_table_name', $config['tables']['class']);
@@ -125,7 +133,6 @@ class SecurityExtension extends Extension
         $container->setParameter('security.acl.dbal.oid_ancestors_table_name', $config['tables']['object_identity_ancestors']);
         $container->setParameter('security.acl.dbal.sid_table_name', $config['tables']['security_identity']);
 
-        $container->getDefinition('security.acl.voter.basic_permissions')->addArgument($config['voter']['allow_if_object_identity_unavailable']);
     }
 
     /**
@@ -594,3 +601,4 @@ class SecurityExtension extends Extension
         return 'http://symfony.com/schema/dic/security';
     }
 }
+