GitLab

Also remove layout test support's direct use of ManifestFetcher,
changing it to use ManifestManager instead.

Bug: 704441
Change-Id: I0417baaf6598a8c7d967e3ce1fd32e78bea22aa0
Reviewed-on: https://chromium-review.googlesource.com/774040Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Sam McNally <sammc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521548}