Update from https://crrev.com/312398

net/quic/quic_server_session.cc

Index: net/quic/quic_server_session.cc
diff --git a/net/quic/quic_server_session.cc b/net/quic/quic_server_session.cc
index 64857c0857679943bb031d441465701b3b761a8a..41b2a88bc5d5112887f2de84d00ad8cad8fd7576 100644
--- a/net/quic/quic_server_session.cc
+++ b/net/quic/quic_server_session.cc
@@ -79,10 +79,6 @@ void QuicServerSession::OnWriteBlocked() {
 }
 
 void QuicServerSession::OnCongestionWindowChange(QuicTime now) {
-  if (connection()->version() <= QUIC_VERSION_21) {
-    return;
-  }
-
   // Only send updates when the application has no data to write.
   if (HasDataToWrite()) {
     return;