Update dart:async to match the Dart repo.

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.
 
 (function() {
   'use strict';
 
   let dart_sdk = dart_library.import('dart_sdk');
   dart_sdk._isolate_helper.startRootIsolate(function() {}, []);
   let async_helper = dart_library.import('async_helper').async_helper;
@@ skipping 18 matching lines @@
       'arithmetic2_test': fail,
       'assert_with_type_test_or_cast_test': skip_fail,
       'assertion_test': skip_fail,
       'async_await_test_none_multi': 'unittest',
       'async_star_await_pauses_test': skip_fail,
 
       // TODO(jmesserly): figure out why this test is hanging.
       'async_star_cancel_and_throw_in_finally_test': skip_timeout,
 
       'async_star_cancel_while_paused_test': skip_fail,
-      'async_star_regression_fisk_test': skip_fail,
 
       // TODO(vsm): Re-enable.
       // See https://github.com/dart-lang/dev_compiler/issues/456
       'async_star_test_none_multi': ['unittest', 'skip', 'fail'],
       'async_star_test_01_multi': ['unittest', 'skip', 'fail'],
       'async_star_test_02_multi': ['unittest', 'skip', 'fail'],
       'async_star_test_03_multi': ['unittest', 'skip', 'fail'],
       'async_star_test_04_multi': ['unittest', 'skip', 'fail'],
       'async_star_test_05_multi': ['unittest', 'skip', 'fail'],
 
-      'async_switch_test': skip_fail,
       'asyncstar_throw_in_catch_test': skip_fail,
       'await_future_test': skip_fail,
       'bit_operations_test_none_multi': skip_fail,
       'bit_shift_test': skip_fail,
       'bool_test': skip_fail,
       'bound_closure_equality_test': skip_fail,
       'branch_canonicalization_test': skip_fail,  // JS bit operations truncate to 32 bits.
       'call_closurization_test': skip_fail,
       'call_function_apply_test': skip_fail,
       'call_operator_test': skip_fail,
@@ skipping 471 matching lines @@
 
         if (!async_helper.asyncTestStarted) done();
       });
     }
   }
 
   for (let action of unittest_tests) {
     action();
   }
 })();