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This CL moves any existing uses in Android of MediaMetadata
to the new version in the media_session service.

BUG=875004

Binary-Size: Adding duplicate classes that will be removed
in https://crrev.com/c/1241554

Change-Id: I8ed9afd45a37e515ae89d5d82a542a6f4c139136
Reviewed-on: https://chromium-review.googlesource.com/c/1241466
Commit-Queue: Becca Hughes <beccahughes@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605498}