Simplify UberQuicStreamIdManagerTest.
Simplify UberQuicStreamIdManagerTest.

gfe-relnote: n/a. test only.
PiperOrigin-RevId: 285062876
Change-Id: I77eedc6fb73691330925d7fc37ac43a039b89c20

google/quiche,google/quiche,google/quiche,google/quiche