Use QuicSession::transport_version() instead of QuicConnection::transport_version() to make code cleaner.

gfe-relnote: code cleanup, not protected.
PiperOrigin-RevId: 267628510
Change-Id: I2b28c42ec2345870905e7e5d7e88721be86ad6e4
diff --git a/quic/test_tools/quic_test_client.cc b/quic/test_tools/quic_test_client.cc
index 402a231..9d4cb03 100644
--- a/quic/test_tools/quic_test_client.cc
+++ b/quic/test_tools/quic_test_client.cc
@@ -377,7 +377,7 @@
   ssize_t ret = SendMessage(headers, "", /*fin=*/true, /*flush=*/false);
 
   QuicStreamId stream_id = GetNthClientInitiatedBidirectionalStreamId(
-      session->connection()->transport_version(), 0);
+      session->transport_version(), 0);
   session->SendRstStream(stream_id, QUIC_STREAM_CANCELLED, 0);
   return ret;
 }