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Previously the test flakily failed because of the video might be empty
when the test ended.

Convert the test into a testharness test to avoid the flakiness.
As this test just ensures it doesn't crash, we just expect the test
finishes without crash.

Bug: 1082820
Change-Id: I846b8cb2f66641759f8a349ef864747c1b95cb1d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2204830
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Thomas Guilbert <tguilbert@chromium.org>
Auto-Submit: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#769896}