The MediaControllerImplBase listener invocations currently use the
class member state that can change if one of the listener method
implementations changes the state recursively.
Updating the listener invocations to use a final local variable
ensures all listeners get consistent updates.
PiperOrigin-RevId: 487503373
(cherry picked from commit 33bea391d42cb5669e6d2c97c0553f3c0c63467b)
7f17ff6d00