Mark test as passing on FF

pkg/dev_compiler/test/browser/language_tests.js

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 define(['dart_sdk', 'async_helper', 'expect', 'unittest', 'is', 'require'],
       function(dart_sdk, async_helper, expect, unittest, is, require) {
   'use strict';
 
   async_helper = async_helper.async_helper;
   let minitest = expect.minitest;
@@ skipping 272 matching lines @@
       'string_interpolate_null_test': skip_fail,
       'super_operator_index3_test': skip_fail,
       'super_operator_index4_test': skip_fail,
       'switch_label2_test': skip_fail,
       'switch_label_test': skip_fail,
       'switch_try_catch_test': skip_fail,
       'sync_generator1_test_none_multi': skip_fail,
       'throwing_lazy_variable_test': skip_fail,
       'top_level_non_prefixed_library_test': skip_fail,
       'truncdiv_test': fail,  // did not throw
-      'type_literal_test': firefox_fail,
       'type_variable_nested_test': skip_fail,  // unsound is-check
       'type_variable_typedef_test': skip_fail,  // unsound is-check
 
       'bit_operations_test_01_multi': skip_fail,
       'bit_operations_test_02_multi': skip_fail,
       'bit_operations_test_03_multi': skip_fail,
       'bit_operations_test_04_multi': skip_fail,
       'bool_condition_check_test_01_multi': skip_fail,
       'deferred_constraints_constants_test_none_multi': skip_fail,
       'deferred_constraints_constants_test_reference_after_load_multi': skip_fail,
@@ skipping 540 matching lines @@
 
     for (let action of unittest_tests) {
       try {
         action();
       } catch (e) {
         console.error("Caught error tying to setup test:", e);
       }
     }
   });
 });