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This change removes the icon from the Picture-in-Picture interstitial.
The text is also moved to the top left of the interstitial and styled
to play well with the modern media controls, e.g. Play/Pause button
will no longer cover the interstitial content.

BUG: 844357
Change-Id: I3eed46bece9f9b26257a4d2ed4b7a0b6cb3818b8
Reviewed-on: https://chromium-review.googlesource.com/1071231
Commit-Queue: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561889}