Prevent QPACK streams from being created more than once.

gfe-relnote: v99 only, not protected.
PiperOrigin-RevId: 264666019
Change-Id: I01b408b87ab7c19f0c505753660ef0c1ffad53f4
diff --git a/quic/core/http/quic_spdy_session.h b/quic/core/http/quic_spdy_session.h
index ce69b89..e16e09a 100644
--- a/quic/core/http/quic_spdy_session.h
+++ b/quic/core/http/quic_spdy_session.h
@@ -282,6 +282,9 @@
   void OnPriority(spdy::SpdyStreamId stream_id,
                   const spdy::SpdyStreamPrecedence& precedence);
 
+  void CloseConnectionOnDuplicateHttp3UnidirectionalStreams(
+      QuicStringPiece type);
+
   std::unique_ptr<QpackEncoder> qpack_encoder_;
   std::unique_ptr<QpackDecoder> qpack_decoder_;