[ticket/11415] Remove migrator dependency from extension manager

PHPBB3-11415

tests/extension/manager_test.php

@@ -107,11 +107,13 @@ class phpbb_extension_manager_test extends phpbb_database_test_case
 			$table_prefix,
 			array()
 		);
+		$container = new phpbb_mock_container_builder();
+		$container->set('migrator', $migrator);
+
 		return new phpbb_extension_manager(
-			new phpbb_mock_container_builder(),
+			$container,
 			$db,
 			$config,
-			$migrator,
 			new phpbb_filesystem(),
 			'phpbb_ext',
 			dirname(__FILE__) . '/',