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It's seen to time out on the linux-chromeos-rel tryserver which is
affecting the CQ. Until someone is found to investigate the timeouts,
turn off the test.

BUG=794490
TBR=lazyboy@chromium.org

Change-Id: Idbf5f975df1e9b9e49f10c68bef0112e7545b541
Reviewed-on: https://chromium-review.googlesource.com/829892Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524451}