deprecating FLAGS_quic_ack_notifier_informed_on_serialized.

net/quic/quic_flags.cc

Index: net/quic/quic_flags.cc
diff --git a/net/quic/quic_flags.cc b/net/quic/quic_flags.cc
index 77ae081f096563f7eaafc1b3008845ddc61ac7dc..22a7fa99f7fe421edf83f7f29116339e30ee489f 100644
--- a/net/quic/quic_flags.cc
+++ b/net/quic/quic_flags.cc
@@ -52,10 +52,6 @@ bool FLAGS_quic_rto_uses_last_sent = true;
 // frames.
 bool FLAGS_quic_attach_ack_notifiers_to_packets = true;
 
-// If true, the AckNotifierManager is informed about new packets as soon as they
-// are serialized.
-bool FLAGS_quic_ack_notifier_informed_on_serialized = true;
-
 // If true, QUIC will use the new RTO that waits until an ack arrives to adjust
 // the congestion window.
 bool FLAGS_quic_use_new_rto = true;