Add a version() convenience method to ReliableQuicStream.

net/quic/reliable_quic_stream.h

Index: net/quic/reliable_quic_stream.h
diff --git a/net/quic/reliable_quic_stream.h b/net/quic/reliable_quic_stream.h
index 210b8ad0c4eb274391c4dae52550c31decda7cc4..7b0a79068d58ecf42e60f4dc5a92c23ead1fbaaa 100644
--- a/net/quic/reliable_quic_stream.h
+++ b/net/quic/reliable_quic_stream.h
@@ -86,6 +86,8 @@ class NET_EXPORT_PRIVATE ReliableQuicStream {
   uint64 stream_bytes_read() { return stream_bytes_read_; }
   uint64 stream_bytes_written() { return stream_bytes_written_; }
 
+  QuicVersion version();
+
  protected:
   // Sends as much of 'data' to the connection as the connection will consume,
   // and then buffers any remaining data in queued_data_.