GitLab

If an extension has an <iframe> it should be allowed to autoplay.

BUG=821284

Change-Id: I1e11cbdef6a81acf5ea3e6d3dcaadc8c13464c16
Reviewed-on: https://chromium-review.googlesource.com/962803Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Charlie Reis <creis@chromium.org>
Commit-Queue: Becca Hughes <beccahughes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551018}