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Rollback of https://github.com/google/ExoPlayer/commit/fdfe631850908e1e4b8641d5ef2f084a39f2347d · 3eea7970
*** Original commit *** Remove null-ness of muxedCaptionFormats list Pre-work for removing HlsMasterPlaylist and HlsPlaylistParser from null-checking blacklist. *** PiperOrigin-RevId: 274591502
ibaker committed