Support 20byte connection IDs in QUIC v99

gfe-relnote: change max connection ID length, protected by disabled flag quic_enable_v99
PiperOrigin-RevId: 261237446
Change-Id: Iba22fe96d6a392c97f75f92f5c3b9ed7b11e3828
diff --git a/quic/core/quic_framer.cc b/quic/core/quic_framer.cc
index bd0a724..91d4a0a 100644
--- a/quic/core/quic_framer.cc
+++ b/quic/core/quic_framer.cc
@@ -6611,7 +6611,7 @@
     QUIC_BUG << "Invalid packet_length";
     return false;
   }
-  if (destination_connection_id_length > kQuicMaxConnectionIdLength ||
+  if (destination_connection_id_length > kQuicMaxConnectionId4BitLength ||
       destination_connection_id_length <
           kQuicMinimumInitialConnectionIdLength) {
     QUIC_BUG << "Invalid connection_id_length";