QUIC - Disable Preconnect when QUIC can be spoken to a server with 0RTT

net/quic/quic_stream_factory.cc

Index: net/quic/quic_stream_factory.cc
diff --git a/net/quic/quic_stream_factory.cc b/net/quic/quic_stream_factory.cc
index 096ea6abc272715f285dcd509dc3eb7266b70178..2443381e3e4f20654a2aba7b839876f455279a42 100644
--- a/net/quic/quic_stream_factory.cc
+++ b/net/quic/quic_stream_factory.cc
@@ -685,6 +685,10 @@ void QuicStreamFactory::set_require_confirmation(bool require_confirmation) {
   }
 }
 
+bool QuicStreamFactory::ZeroRTTEnabledFor(const QuicServerId& quic_server_id) {
+  return !(require_confirmation_ || CryptoConfigCacheIsEmpty(quic_server_id));
+}
+
 base::TimeDelta QuicStreamFactory::GetTimeDelayForWaitingJob(
     const QuicServerId& server_id) {
   if (!delay_tcp_race_ || require_confirmation_)