Flip QUIC flags, and remove deprecated flags that were missed.

net/quic/core/quic_flags_list.h

Index: net/quic/core/quic_flags_list.h
diff --git a/net/quic/core/quic_flags_list.h b/net/quic/core/quic_flags_list.h
index eeb899854124b376392a689c8028d23d122a0fcb..e59f187b9a26f0a6411fd2a69e16d5d38974617b 100644
--- a/net/quic/core/quic_flags_list.h
+++ b/net/quic/core/quic_flags_list.h
@@ -62,9 +62,6 @@ QUIC_FLAG(bool,
           FLAGS_quic_reloadable_flag_quic_respect_http2_settings_frame,
           true)
 
-// If true, re-enables QUIC_VERSION_36.
-QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_version_36_v3, true)
-
 // If true, only open limited number of quic sessions per epoll event. Leave the
 // rest to next event.
 QUIC_FLAG(bool,
@@ -122,9 +119,6 @@ QUIC_FLAG(bool,
 // If true, fix Cubic\'s use of kBetaLastMax for n-connection emulation.
 QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_fix_beta_last_max, false)
 
-// If true, enable QUIC v37.
-QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_version_37, 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)
@@ -139,7 +133,7 @@ QUIC_FLAG(bool,
 
 // 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)
+QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_allow_2_rtt_bbr_startup, true)
 
 // If true, do not send or process stop waiting frames in QUIC if the NSTP
 // connection option is provided.
@@ -175,10 +169,6 @@ QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_bbr_bandwidth_resumption, false)
 // Add the equivalent number of bytes as 3 TCP TSO segments to QUIC's BBR CWND.
 QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_bbr_add_tso_cwnd, false)
 
-// Fix a crash that occurs when a client sends multiple CHLOs close together on
-// the same connection.
-QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_fix_quic_callback_crash, true)
-
 // If true, enable version 38 which supports new PADDING frame and respects NSTP
 // connection option.
 QUIC_FLAG(bool, FLAGS_quic_reloadable_flag_quic_enable_version_38, true)