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/http/quic_spdy_stream_test.cc b/quic/core/http/quic_spdy_stream_test.cc
index 66100bb..64e45b9 100644
--- a/quic/core/http/quic_spdy_stream_test.cc
+++ b/quic/core/http/quic_spdy_stream_test.cc
@@ -78,7 +78,7 @@
   size_t WriteHeadersImpl(spdy::SpdyHeaderBlock header_block,
                           bool fin,
                           QuicReferenceCountedPointer<QuicAckListenerInterface>
-                              ack_listener) override {
+                          /*ack_listener*/) override {
     saved_headers_ = std::move(header_block);
     WriteHeadersMock(fin);
     if (VersionUsesQpack(transport_version())) {