We can take out the test case duration output, as it would only be
useful for diagnosing unexpectedly slow tests. This will reduce the
size of dEQP logs on the bots.

BUG=None

Change-Id: I591b2c564e89393ca6754140001f334c19a10b1a
Reviewed-on: https://chromium-review.googlesource.com/361243Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>