[M54 merge] Disables QUIC flag that shifts cubic epoch on quiescence, since shifting code is buggy …

net/quic/core/quic_flags.cc

 // 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.
 
 #include "net/quic/core/quic_flags.h"
 
 // If true, it will return as soon as an error is detected while validating
 // CHLO.
 bool FLAGS_use_early_return_when_verifying_chlo = true;
 
@@ skipping 24 matching lines @@
 
 // If true, multipath is enabled for the connection.
 bool FLAGS_quic_enable_multipath = false;
 
 // If true, require handshake confirmation for QUIC connections, functionally
 // disabling 0-rtt handshakes.
 // TODO(rtenneti): Enable this flag after CryptoServerTest's are fixed.
 bool FLAGS_quic_require_handshake_confirmation = false;
 
 // If true, Cubic's epoch is shifted when the sender is application-limited.
-bool FLAGS_shift_quic_cubic_epoch_when_app_limited = true;
+bool FLAGS_shift_quic_cubic_epoch_when_app_limited = false;
 
 // If true, QUIC will measure head of line (HOL) blocking due between
 // streams due to packet losses on the headers stream.  The
 // measurements will be surfaced via UMA histogram
 // Net.QuicSession.HeadersHOLBlockedTime.
 bool FLAGS_quic_measure_headers_hol_blocking_time = true;
 
 // If true, disable pacing in QUIC.
 bool FLAGS_quic_disable_pacing_for_perf_tests = false;
 
@@ skipping 107 matching lines @@
 // longer necessary.
 bool FLAGS_quic_simple_packet_number_length_2 = true;
 
 // If true, disables QUIC version less than 32.
 bool FLAGS_quic_disable_pre_32 = true;
 
 // If true, set a QUIC connection's last_sent_for_timeout_ to the send time of
 // the first packet sent after receiving a packet, even if the sent packet is
 // a retransmission
 bool FLAGS_quic_better_last_send_for_timeout = true;