I can't repro this locally, and it's been a while.

Let's unflake it and see how it goes on the bots.

BUG=https://code.google.com/p/dart/issues/detail?id=12570
R=nweiz@google.com

Review URL: https://codereview.chromium.org//86463002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@30822 260f80e4-7a28-3924-810f-c04153c831b5