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If the experiment to disable chrome://media-internals is enabled, then
we need to tell users what is up, and how to access the new version.
Of course this is dependent on the new UI getting checked in.

Bug: 794255
Change-Id: I84f71e6034c53be97a943d4c3cbc3dc2c0a9aca6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1767423
Commit-Queue: Ted Meyer <tmathmeyer@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Frank Liberato <liberato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703988}