[Picture-in-Picture] Update feature policy default allowlist to *.

This CL reflects updated spec which changes Picture-in-Picture feature
to be allowed by default to documents in child frames.

Bug: 806249
Change-Id: I7c7a3a073b30ad5118aa634b0c0b1f3ac60d2e7a
Reviewed-on: https://chromium-review.googlesource.com/926104
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Ian Clelland <iclelland@chromium.org>
Commit-Queue: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#538145}
2 files changed