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This CL removes MPRIS from components and moves it into ui/base.

Bug: 935624
Change-Id: Ie0bbf358a4df00e5e1b8905576c3e85ed7b29eab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1506465Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638342}