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This CL makes sure video do not pause when playing in Picture-in-Picture
and subsequently removed from the Document.

Spec: https://github.com/w3c/picture-in-picture/issues/99

Change-Id: Ifefd961803cc47c64d394aa52454313cbcef603a
Bug: 1167643
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2627311
Commit-Queue: François Beaufort <beaufort.francois@gmail.com>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845100}