tianyifeng 28c70e5e54 Add remove(MediaSource) to BasePreloadManager
Both `remove(MediaItem)` and `remove(MediaSource)` return a boolean suggesting that whether the preload manager is holding the corresponding `MediaSource` and it has been removed.

PiperOrigin-RevId: 622185427
2024-04-05 08:27:27 -07:00
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