QuicCryptoProof now takes a ref to the Config instead of its SCID

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 0d0a5c3c02ea7b459b34e1cee1a14464dcb8647d..53f2453ac4a4d21c2efadb91e836331e0e10d794 100644
--- a/net/quic/quic_flags.cc
+++ b/net/quic/quic_flags.cc
@@ -168,3 +168,7 @@ bool FLAGS_quic_include_path_id_in_iv = true;
 // If true, make sure new incoming streams correctly cede to higher
 // priority (or batch) streams when doing QUIC writes.
 bool FLAGS_quic_cede_correctly = true;
+
+// Has QuicCryptoProof hold a ref to the primary_config instead of storing its
+// SCID.
+bool FLAGS_quic_crypto_proof_use_ref = true;