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This also switches from running tests through the butler to
running tests alongside the butler s.t. we can independently
control process lifetimes.

Bug: 721889
Change-Id: I176b7340d9b3f097ad660b66ea64ffb4816287a8
Reviewed-on: https://chromium-review.googlesource.com/667808
Commit-Queue: John Budorick <jbudorick@chromium.org>
Reviewed-by: Benjamin Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#502757}