Remove a test that is incredibly flaky on some platforms.

Remove a test that is incredibly flaky on some platforms.

I have an improved version in another CL, but it found a bug in dart2js, so I'll delay  committing until the bug's fixed.

Committed: https://code.google.com/p/dart/source/detail?r=44430

[Lasse Reichstein Nielsen, 2015-03-12 15:15:41]

lrn@google.com changed reviewers:
+ sigurdm@google.com

[Lasse Reichstein Nielsen, 2015-03-12 15:15:41]

TBR

[Lasse Reichstein Nielsen, 2015-03-12 15:16:38]

Committed patchset #1 (id:1) manually as 44430 (presubmit successful).

[sigurdm, 2015-03-12 15:16:57]

lgtm