Simplify AckNotifierWithPacketLossAndBlockedSocket test.
Simplify AckNotifierWithPacketLossAndBlockedSocket test.

Test-only change

PiperOrigin-RevId: 312324172
Change-Id: Iaded3747494e6e093cb787dfd86f706b4577b05c

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