Those classes only needed to have access to a `SubtitleParser.Factory` to get a potentially updated `Format` for TrackGroups. The `SubtitleParser.Factory` was only used to check the support for the `mimeType` and getting some cue-related behaviour.
This introduced complexity in a way that both Periods and Extractors needed to have the same `SubtitleParser.Factory` in their individual stacks. To ensure that the sample queue would get the same transcoded/original format.
Instead, now we expose `getOutputTextFormat` methods on `ChunkExtractor.Factory`, `SsChunkSource.Factory` and `HlsExtractorFactory`. Those are the dependencies that Hls/Ss/DashMediaPeriod can make use of to delegate the format-updating logic to.
#minor-release
PiperOrigin-RevId: 601130714
966b710897