Typo in test is exposed as a flaky test
Typo in test is exposed as a flaky test

I recently updated these tests to reduce flakiness, but there
was a typo in one line of the update.

Since tasks were run serially, the total time to run N-1 tasks should
be greater than or EQUAL to the task durtaion, times N-1.

r=mark
Review URL: http://codereview.chromium.org/74003

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@13640 0039d316-1c4b-4281-b951-d872f2087c98

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