Remove unused "using base::Time"

When experimenting with jumbo builds in content this Time conflicts
with other things, and since it's unused it's easy to just remove it.

Change-Id: I853e2da58963c875158b750839a706e49edad93e
Reviewed-on: https://chromium-review.googlesource.com/653161
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Daniel Bratell <bratell@opera.com>
Cr-Commit-Position: refs/heads/master@{#500370}
1 file changed