Update from https://crrev.com/302630

net/quic/quic_flags.cc

Index: net/quic/quic_flags.cc
diff --git a/net/quic/quic_flags.cc b/net/quic/quic_flags.cc
index ae57199b924fd40c660342c59a7c82cfc49fee51..682e06ece2dc01a595d21f9a1d40812be730f7d9 100644
--- a/net/quic/quic_flags.cc
+++ b/net/quic/quic_flags.cc
@@ -58,3 +58,7 @@ bool FLAGS_allow_truncated_connection_ids_for_quic = false;
 // If true, close the connection when there are too many outstanding QUIC
 // packets in the sent or received packet managers.
 bool FLAGS_quic_too_many_outstanding_packets = false;
+
+// If true, QUIC connections will delay moving to forward security until the
+// client starts sending foward secure encrypted packets.
+bool FLAGS_enable_quic_delay_forward_security = true;