Remove support for QUIC_VERSION_16.

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 42c05b612a239786888cdb06469ba2d2e045ed60..4bae2f5e59c0fff226184300b5fcbfd43a2c444d 100644
--- a/net/quic/quic_session.cc
+++ b/net/quic/quic_session.cc
@@ -487,10 +487,6 @@ void QuicSession::OnConfigNegotiated() {
     set_max_open_streams(max_streams);
   }
 
-  if (version <= QUIC_VERSION_16) {
-    return;
-  }
-
   if (version <= QUIC_VERSION_19) {
     // QUIC_VERSION_17,18,19 don't support independent stream/session flow
     // control windows.
@@ -782,12 +778,6 @@ void QuicSession::OnSuccessfulVersionNegotiation(const QuicVersion& version) {
     GetCryptoStream()->flow_controller()->Disable();
     headers_stream_->flow_controller()->Disable();
   }
-  for (DataStreamMap::iterator it = stream_map_.begin();
-       it != stream_map_.end(); ++it) {
-    if (version <= QUIC_VERSION_16) {
-      it->second->flow_controller()->Disable();
-    }
-  }
 }
 
 }  // namespace net