On Mac, the timer queries tests have flakiness as the tests may timeout
before the query result is available. The time to wait before throwing a
timeout error in the tests was therefore increased by a factor of 20.

BUG=585498

Change-Id: I55047ee7759e6d2dde69294df451202dfb498034
Reviewed-on: https://chromium-review.googlesource.com/327031
Commit-Queue: Ian Ewell <ewell@google.com>
Reviewed-by: Ian Ewell <ewell@google.com>