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This should avoid sporadic false failures with this test. If in the future we genuinely regress bug 21448, there is a danger that this test won't catch it reliably, but that is mitigated by the fact that (a) even flaky failures do get noticed, and (b) the bug was severe enough that it probably would be noticed in manual testing. The extra risk seems worth it to avoid the sporadic false failures we've been seeing. BUG=dartbug.com/21638 R=scheglov@google.com Review URL: https://codereview.chromium.org//724403003 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@41870 260f80e4-7a28-3924-810f-c04153c831b5