Flags change for this week's merge. These flags were introduced this

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 123 matching lines @@
 QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_version_37, true)
 
 // If true, disables QUIC v34.
 QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_disable_version_34, true)
 
 // If true, enable quic version 38
 QUIC_FLAG(bool, FLAGS_quic_enable_version_38, false)
 
 // When true, ensures the session's flow control window is always at least 1.5x
 // larger than the largest stream flow control window.
-QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_flow_control_invariant, false)
+QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_flow_control_invariant, true)
 
 // If greater than zero, mean RTT variation is multiplied by the specified
 // factor and added to the congestion window limit.
 QUIC_FLAG(double, FLAGS_quic_bbr_rtt_variation_weight, 0.0f)
 
 // Congestion window gain for QUIC BBR during PROBE_BW phase.
 QUIC_FLAG(double, FLAGS_quic_bbr_cwnd_gain, 2.0f)
 
 // If true, bidi streaming is always enabled in QUIC.
 QUIC_FLAG(bool,
           FLAGS_quic_reloadable_flag_quic_always_enable_bidi_streaming,
           false)
 
 // If true, allows the 1RTT and 2RTT connection options to reduce the time
 // in BBR STARTUP to 1 or 2 RTTs with no bandwidth increase from 3.
 QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_allow_2_rtt_bbr_startup, false)
 
 // If true, do not send or process stop waiting frames in QUIC if the NSTP
 // connection option is provided.
 QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_no_stop_waiting_frames, false)
 
 // Allows one self address change.
 QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_allow_one_address_change, false)
 
 // If true, no longer send or process the SRBF value in QuicConfig.
-QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_no_socket_receive_buffer, true)
+QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_no_socket_receive_buffer, false)
 
 // If true, multipath bit is not used in public flag.
-QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_remove_multipath_bit, true)

[Ryan Hamilton, 2017/03/10 15:16:23]

It's surprising that these were true and are now false. Were they rolled back
internally, or were they explicitly set to true early in Chrome?

+QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_remove_multipath_bit, false)