MediaItem2: Don't throw exception for media ID changes
MediaItem2: Don't throw exception for media ID changes

Exception should be only thrown only when the parameter violates
requirements annotation, and can be checked without accessing internal
variables.

Test: $ ./gradlew media2:connectedCheck
Change-Id: I5ffd9edfac7cb1dbdf0b25cf10e644efade2ce20

androidx/androidx,androidx/androidx,androidx/androidx,androidx/androidx,androidx/androidx,androidx/androidx,androidx/androidx,androidx/androidx,AndroidX/androidx,AndroidX/androidx,androidx/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,androidx/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx