Fix QUIC warnings in preparation for enabling them

gfe-relnote: n/a, compilation-only change
PiperOrigin-RevId: 253893322
Change-Id: I15917a1c5b325922850086277cfad5e3b4da20a4
diff --git a/quic/core/quic_sent_packet_manager_test.cc b/quic/core/quic_sent_packet_manager_test.cc
index 58d8b14..2fbd85f 100644
--- a/quic/core/quic_sent_packet_manager_test.cc
+++ b/quic/core/quic_sent_packet_manager_test.cc
@@ -161,7 +161,7 @@
     EXPECT_CALL(*network_change_visitor_, OnCongestionChange());
   }
 
-  void ExpectUpdatedRtt(uint64_t largest_observed) {
+  void ExpectUpdatedRtt(uint64_t /*largest_observed*/) {
     EXPECT_CALL(*send_algorithm_,
                 OnCongestionEvent(true, _, _, IsEmpty(), IsEmpty()));
     EXPECT_CALL(*network_change_visitor_, OnCongestionChange());