Tighten up the expectations of number of packets sent on the 6PTO test in QuicConnectionTest.
Tighten up the expectations of number of packets sent on the 6PTO test in QuicConnectionTest.

PiperOrigin-RevId: 310899283
Change-Id: Ibc3ccf29c61e93333157b43b021013cb2b7a35c9

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