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This is a simple one and gets rid of a redundant call to
TimeTicks::Now() thanks to the new API :)

Bug: 885371
Change-Id: I3dccde418849992ad0bce18297c79eea6f98f072
Reviewed-on: https://chromium-review.googlesource.com/c/1485125
Commit-Queue: Gabriel Charette <gab@chromium.org>
Reviewed-by: kylechar <kylechar@chromium.org>
Auto-Submit: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636910}