Use play() instead of autoplay in Picture-in-Picture test.

Change-Id: I887f62915f3220652cfe9a440d1d2133f61b7bf8
Reviewed-on: https://chromium-review.googlesource.com/c/1360651
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Commit-Queue: François Beaufort <beaufort.francois@gmail.com>
Cr-Commit-Position: refs/heads/master@{#615857}
1 file changed