Migrate block 37, language/arithmetic2 ... /async_await_syntax_test.

tests/compiler/dart2js_extra/assert_with_message_test.dart

Index: tests/compiler/dart2js_extra/assert_with_message_test.dart
diff --git a/tests/compiler/dart2js_extra/assert_with_message_test.dart b/tests/compiler/dart2js_extra/assert_with_message_test.dart
index a5b14eeab08033f42bbc286de71ba4af6b8fd909..9d2fa14862e048443d324425e19149d881c35707 100644
--- a/tests/compiler/dart2js_extra/assert_with_message_test.dart
+++ b/tests/compiler/dart2js_extra/assert_with_message_test.dart
@@ -1,7 +1,6 @@
 // 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.
-// SharedOptions=--assert-message
 
 import "package:expect/expect.dart";