not sending kFIXD in QUIC handshake. behind FLAGS_quic_deprecate_kfixd

net/quic/quic_crypto_client_stream.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_crypto_client_stream.h"
 
 #include <memory>
 #include <vector>
 
 #include "base/metrics/histogram_macros.h"
 #include "base/metrics/sparse_histogram.h"
 #include "base/strings/stringprintf.h"
 #include "net/quic/crypto/crypto_protocol.h"
 #include "net/quic/crypto/crypto_utils.h"
 #include "net/quic/crypto/null_encrypter.h"
 #include "net/quic/quic_flags.h"
 #include "net/quic/quic_protocol.h"
 #include "net/quic/quic_session.h"
 #include "net/quic/quic_utils.h"
 
 using std::string;
 using std::vector;
 
 namespace net {
 
 namespace {
 
 void AppendFixed(CryptoHandshakeMessage* message) {
+  if (FLAGS_quic_deprecate_kfixd) {
+    return;
+  }
   vector<QuicTag> tags;
   tags.push_back(kFIXD);
 
   const QuicTag* received_tags;
   size_t received_tags_length;
   QuicErrorCode error =
       message->GetTaglist(kCOPT, &received_tags, &received_tags_length);
   if (error == QUIC_NO_ERROR) {
     for (size_t i = 0; i < received_tags_length; ++i) {
       tags.push_back(received_tags[i]);
@@ skipping 647 matching lines @@
   }
   for (size_t i = 0; i < num_their_proof_demands; i++) {
     if (their_proof_demands[i] == kCHID) {
       return true;
     }
   }
   return false;
 }
 
 }  // namespace net