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/qbone/qbone_control_stream.cc b/quic/qbone/qbone_control_stream.cc
index 6272f3f..02b1cb8 100644
--- a/quic/qbone/qbone_control_stream.cc
+++ b/quic/qbone/qbone_control_stream.cc
@@ -15,11 +15,11 @@
 }  // namespace
 
 QboneControlStreamBase::QboneControlStreamBase(QuicSession* session)
-    : QuicStream(QboneConstants::GetControlStreamId(
-                     session->connection()->transport_version()),
-                 session,
-                 /*is_static=*/true,
-                 BIDIRECTIONAL),
+    : QuicStream(
+          QboneConstants::GetControlStreamId(session->transport_version()),
+          session,
+          /*is_static=*/true,
+          BIDIRECTIONAL),
       pending_message_size_(0) {}
 
 void QboneControlStreamBase::OnDataAvailable() {