This is known to silently drop the value. This setter is now deprecated
in favour of `MediaItem.Builder#setDrmConfiguration(MediaItem.DrmConfiguration)`,
which requires a UUID in order to construct the `DrmConfiguration`
instance.
Issue: #9378 tracks correctly propagating the DRM info out of
`DownloadRequest#toMediaItem`.
PiperOrigin-RevId: 397291013
