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It uses the idiomatic TestTimeouts::action_max_timeout() instead.

Also, it fixes an assert to keep lint happy.

Bug: 1163363
Change-Id: I76289b8216e5d8d6dcb729628129835253bcc25c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2611641
Commit-Queue: Sorin Jianu <sorin@chromium.org>
Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840647}