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This is forcing no autoplay restrictions to all `Extensions`. It does
not apply to WebViews.

Bug: 788302
Change-Id: I9c7e89133279453382976ff0f79d285672a5f1ac
Reviewed-on: https://chromium-review.googlesource.com/803440Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Finnur Thorarinsson <finnur@chromium.org>
Commit-Queue: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523747}