Update status for front_end/test/mixin_export_test

Update status for front_end/test/mixin_export_test

Commit 48503c8720d758a61cc4ceb1281bdd81fbd92e13 introduces test case
pkg/front_end/test/mixin_export_test.dart that passes on d8, but doesn't
work in browsers.  An issue is created for that (dartbug.com/30576).
This CL changes the status for the tests on browsers.

R=johnniwinther@google.com

Committed: https://github.com/dart-lang/sdk/commit/0cf1f7685d17b82fbb8d2993880aa5f672319a98

[Dmitry Stefantsov, 2017-08-30 09:44:48]

dmitryas@google.com changed reviewers:
+ johnniwinther@google.com

[Johnni Winther, 2017-08-30 09:48:10]

lgtm

[Dmitry Stefantsov, 2017-08-30 10:01:05]

Description was changed from

==========
Update status for front_end/test/mixin_export_test

Commit 48503c8720d758a61cc4ceb1281bdd81fbd92e13 introduces test case
pkg/front_end/test/mixin_export_test.dart that passes on d8, but doesn't
work in browsers.  An issue is created for that (dartbug.com/30576).
This CL changes the status for the tests on browsers.
==========

to

==========
Update status for front_end/test/mixin_export_test

Commit 48503c8720d758a61cc4ceb1281bdd81fbd92e13 introduces test case
pkg/front_end/test/mixin_export_test.dart that passes on d8, but doesn't
work in browsers.  An issue is created for that (dartbug.com/30576).
This CL changes the status for the tests on browsers.

R=johnniwinther@google.com

Committed:
https://github.com/dart-lang/sdk/commit/0cf1f7685d17b82fbb8d2993880aa5f672319a98
==========

[Dmitry Stefantsov, 2017-08-30 10:01:08]

Committed patchset #2 (id:20001) manually as
0cf1f7685d17b82fbb8d2993880aa5f672319a98 (presubmit successful).