SDK / exoplayer

We don't expect this case to occur, since track selection is
normally expected to check canAcquireSession before selecting
a track. Nevertheless, if an attempt is made to acquire a
session when the media doesn't support the manager's UUID, we
should fail in a more graceful way.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=173124170