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Fix some comments about UYVY format in tests and remove remaining
references to this format.

Bug: 988538
Change-Id: Ib14051e146c49df7b654b6192b7d4a28935dc922
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1825080Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Emily Stark <estark@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Sasha McIntosh <sashamcintosh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706991}