Deprecate --gfe2_reloadable_flag_quic_stop_checking_for_mismatch_ids

net/quic/reliable_quic_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/reliable_quic_stream.h"
 
 #include "base/logging.h"
 #include "net/quic/iovector.h"
 #include "net/quic/quic_ack_listener_interface.h"
 #include "net/quic/quic_flags.h"
@@ skipping 82 matching lines @@
 
   bool flag_value = FLAGS_quic_fix_fin_accounting;
   if (!flag_value) {
     if (read_side_closed_) {
       DVLOG(1) << ENDPOINT << "Ignoring frame " << frame.stream_id;
       // The subclass does not want to read data:  blackhole the data.
       return;
     }
   }
 
-  if (!FLAGS_quic_stop_checking_for_mismatch_ids && frame.stream_id != id_) {
-    session_->connection()->SendConnectionClose(QUIC_INTERNAL_ERROR);
-    return;
-  }
-
   if (frame.fin) {
     fin_received_ = true;
     if (fin_sent_) {
       session_->StreamDraining(id_);
     }
   }
 
   if (flag_value) {
     if (read_side_closed_) {
       DVLOG(1) << ENDPOINT << "Ignoring data in frame " << frame.stream_id;
@@ skipping 352 matching lines @@
   }
 }
 
 void ReliableQuicStream::UpdateSendWindowOffset(QuicStreamOffset new_window) {
   if (flow_controller_.UpdateSendWindowOffset(new_window)) {
     OnCanWrite();
   }
 }
 
 }  // namespace net