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Without this, state persists between tests, which of course causes
failures.

R=sky@chromium.org

Bug: 961849
Change-Id: Ie74936ebfed4bacfa721dcba446905f4fe770faa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1677591
Commit-Queue: danakj <danakj@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#672669}