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This CL changes the media controls' behavior in system menu such that
it will be in an empty state instead of hiding after all media have
stopped playing.

Bug: 1133871
Change-Id: I5e42410abf121c94756e18e9a2cd0eb14375e2d2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2441678Reviewed-by: Tommy Steimel <steimel@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Commit-Queue: Jazz Xu <jazzhsu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813047}