"TimelineData handles out of order timestamps" test flakes

[DanTup]

Saw this on Travis, looks like a flake (unrelated to the change I made).

00:46 +21 -1: test/timeline_protocol_test.dart: TimelineData handles out of order timestamps [E]
  Expected: <1>
    Actual: <0>
  
  org-dartlang-sdk:///sdk/lib/_internal/js_runtime/lib/js_helper.dart 1272:37   Object.wrapException
  org-dartlang-sdk:///sdk/lib/_internal/js_runtime/lib/js_helper.dart 1303:25   Object.throwExpression
  package:test_api                                                              Object.expect
  test/timeline_protocol_test.dart 206:7                                        <fn>
  org-dartlang-sdk:///sdk/lib/_internal/js_runtime/lib/async_patch.dart 313:19  

[jacob314]

Fyi @kenzieschmoll have you fixed this issue?

[kenzieschmoll]

I have not fixed this, but I also haven't seen the flake in a while so perhaps it is obsolete. We can close and re-open if we see the flake again.