*** Original commit ***
Rollback of https://github.com/google/ExoPlayer/commit/57182ac7bd32db54d11fd41e21338a2bbfaf043c
*** Original commit ***
Remove `@Nullable` from `MediaSource.Factory` setters
The null-behaviour of these methods creates a minimization footgun,
because **any** call to these setters will prevent R8 from removing
the default implementation (even if it's never used by the app) - this
is because R8 can't tell the default imple...
***
PiperOrigin-RevId: 450453325
