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Fix the export of `MediaSessionPlaybackState` to export the whole enum.

Bug: 1133186
Change-Id: I67897f77d34741e9bf343c157b839fd6f282243f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2543648
Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
Auto-Submit: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Jeremie Boulic <jboulic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828366}