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- Make a best effort to avoid posting MSG_DOWNLOAD_THREAD_STOPPED if the internal thread has already quit. Doing so is harmless, but causes an error in Logcat. We used to generate this warning quite a bit in ExoPlayerImplInternal as well, and we got quite a few issues filed about it, so best to avoid it if possible. - Null out the back reference DownloadThread holds to its manager on release. This avoids a potential issue where a download thread can prevent GC of its manager if it doesn't cancel quickly. There's similar logic (with a similar comment) in Loader.LoadTask. PiperOrigin-RevId: 243365143