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There's no reason to wait for idleness in these tests, the ended,
error, or seek completion signals should be sufficient to quit
immediately.

BUG=1014646
R=gab

Change-Id: I066c7c5718ee9efeb9ab1ef38fdab642619cb423
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1888830Reviewed-by: Gabriel Charette <gab@chromium.org>
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710508}