Remove support for QUIC_VERSION_16.

net/quic/quic_session.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/quic/quic_session.h"
 
 #include "base/stl_util.h"
 #include "net/quic/crypto/proof_verifier.h"
 #include "net/quic/quic_connection.h"
 #include "net/quic/quic_flags.h"
@@ skipping 469 matching lines @@
       // when FIN/RSTs for old streams are lost or arrive out of order.
       // Use a minimum number of additional streams, or a percentage increase,
       // whichever is larger.
       max_streams =
           max(max_streams + kMaxStreamsMinimumIncrement,
               static_cast<uint32>(max_streams * kMaxStreamsMultiplier));
     }
     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.
     if (config_.HasReceivedInitialFlowControlWindowBytes()) {
       // Streams which were created before the SHLO was received (0-RTT
       // requests) are now informed of the peer's initial flow control window.
       uint32 new_window = config_.ReceivedInitialFlowControlWindowBytes();
       OnNewStreamFlowControlWindow(new_window);
       OnNewSessionFlowControlWindow(new_window);
     }
@@ skipping 271 matching lines @@
   if (version < QUIC_VERSION_19) {
     flow_controller_->Disable();
   }
 
   // Disable stream level flow control based on negotiated version. Streams may
   // have been created with a different version.
   if (version < QUIC_VERSION_21) {
     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