Killing off quic V17. Not flag protected.

net/quic/quic_session.cc

Index: net/quic/quic_session.cc
diff --git a/net/quic/quic_session.cc b/net/quic/quic_session.cc
index 4cd9a335718fa52028988f4839d30287673ce05c..2176e6dc439880777c4c0dfd0ef2952c604cb8d2 100644
--- a/net/quic/quic_session.cc
+++ b/net/quic/quic_session.cc
@@ -469,7 +469,7 @@ bool QuicSession::IsCryptoHandshakeConfirmed() {
 void QuicSession::OnConfigNegotiated() {
   connection_->SetFromConfig(config_);
   QuicVersion version = connection()->version();
-  if (version < QUIC_VERSION_17) {
+  if (version <= QUIC_VERSION_16) {
     return;
   }
 
@@ -743,7 +743,7 @@ void QuicSession::OnSuccessfulVersionNegotiation(const QuicVersion& version) {
   // with a different version.
   for (DataStreamMap::iterator it = stream_map_.begin();
        it != stream_map_.end(); ++it) {
-    if (version < QUIC_VERSION_17) {
+    if (version <= QUIC_VERSION_16) {
       it->second->flow_controller()->Disable();
     }
   }