Issue: google/ExoPlayer#9744
We do not rely on the payload type to determine the sample MIME type, we depend
on the SDP message, so it's worthless checking the payload type.
After removing the line, a server can use payload type 35 (an unassigned
payload type) for H264; while normally H264 requires payload type >= 96).
PiperOrigin-RevId: 413658076
fbbedf32f9