fix ntp perf tests
fix ntp perf tests

I have no idea why the only just started failing due to this. I git blamed a lot of files and didn't see any recent changes.

BUG=none
TEST=waterfall

Review URL: http://codereview.chromium.org/7712010

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@97735 0039d316-1c4b-4281-b951-d872f2087c98

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