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This test appears to timeout 100% of the time under Linux, so adding the
Timeout expectation to prevent it from causing try-bot failures until
the issue is addressed.

No-Try: true
Bug: 789533
Change-Id: I384d355689004eadcf16d6357ed164fca05760a4
Reviewed-on: https://chromium-review.googlesource.com/809826Reviewed-by: Wez <wez@chromium.org>
Reviewed-by: Justin Novosad <junov@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521844}