
ChunkSampleSource had a null check solely for the VTT case, where DashChunkSource wasn't setting a MediaFormat on VTT chunks. It's trivial to do so, and is more consistent, so I've done that and removed the null check. Also done some small tidying.
ChunkSampleSource had a null check solely for the VTT case, where DashChunkSource wasn't setting a MediaFormat on VTT chunks. It's trivial to do so, and is more consistent, so I've done that and removed the null check. Also done some small tidying.