Deprecate FLAGS_quic_remove_obsolete_forward_secure.

net/quic/core/quic_flags_list.h

 // Copyright 2014 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.
 
 // This file intentionally does not have header guards, it's included
 // inside a macro to generate values.
 
 // This file contains the list of QUIC protocol flags.
 
 // If true, QUIC BBR congestion control may be enabled via Finch and/or via QUIC
@@ skipping 70 matching lines @@
 QUIC_FLAG(bool, FLAGS_enable_async_get_proof, false)
 
 // If true, requires handshake confirmations for all QUIC handshakes with
 // versions less than 33.
 QUIC_FLAG(bool, FLAGS_quic_require_handshake_confirmation_pre33, false)
 
 // If true, fix a bug with which QuicStreamSequencerBuffer can\'t release block
 // memory in time.
 QUIC_FLAG(bool, FLAGS_quic_sequencer_buffer_retire_block_in_time, true)
 
-// Remove obsolete code to force QUIC to go forward secure, now that the server
-// immediately goes forward secure.
-QUIC_FLAG(bool, FLAGS_quic_remove_obsolete_forward_secure, true)
-
 // If true, close QUIC connection explicitly on write error due to packet being
 // too large.
 QUIC_FLAG(bool, FLAGS_quic_close_connection_on_packet_too_large, true)
 
 // If true, close the write side of a QUIC spdy stream when all queued bytes
 // have been written and a FIN has been sent.
 QUIC_FLAG(bool, FLAGS_quic_close_stream_after_writing_queued_data, true)
 
 // If true, close connection with QUIC_TOO_MANY_FRAME_GAPS error when number of
 // gaps in QuicStreamSequenceBuffer exceeds allowed limit.
@@ skipping 48 matching lines @@
 
 // If true, lazy allocate and early release memeory used in
 // QuicStreamSequencerBuffer to buffer incoming data.
 QUIC_FLAG(bool, FLAGS_quic_reduce_sequencer_buffer_memory_life_time, true)
 
 // If true, allow server address change if it is because of mapped ipv4 address.
 QUIC_FLAG(bool, FLAGS_quic_allow_server_address_change_for_mapped_ipv4, true)
 
 // If true, disables QUIC version less than 34.
 QUIC_FLAG(bool, FLAGS_quic_disable_pre_34, false)