Deprecate --gfe2_reloadable_flag_quic_stop_checking_for_mismatch_ids

net/quic/reliable_quic_stream.cc

Index: net/quic/reliable_quic_stream.cc
diff --git a/net/quic/reliable_quic_stream.cc b/net/quic/reliable_quic_stream.cc
index f4e9a8a8ec34d08a1137ca840d61cd467738a265..a7279a6f2a6b983426ac518461d355708593ed36 100644
--- a/net/quic/reliable_quic_stream.cc
+++ b/net/quic/reliable_quic_stream.cc
@@ -100,11 +100,6 @@ void ReliableQuicStream::OnStreamFrame(const QuicStreamFrame& frame) {
     }
   }
 
-  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_) {