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/core/http/quic_headers_stream_test.cc b/quic/core/http/quic_headers_stream_test.cc
index 2035d47..cfc5381 100644
--- a/quic/core/http/quic_headers_stream_test.cc
+++ b/quic/core/http/quic_headers_stream_test.cc
@@ -202,7 +202,7 @@
     deframer_ = std::unique_ptr<http2::Http2DecoderAdapter>(
         new http2::Http2DecoderAdapter());
     deframer_->set_visitor(&visitor_);
-    EXPECT_EQ(transport_version(), session_.connection()->transport_version());
+    EXPECT_EQ(transport_version(), session_.transport_version());
     EXPECT_TRUE(headers_stream_ != nullptr);
     connection_->AdvanceTime(QuicTime::Delta::FromMilliseconds(1));
     client_id_1_ = GetNthClientInitiatedBidirectionalStreamId(