Deprecate rolled out FLAGS_enable_quic_connection_flow_control_2.

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 58980b343188f17203a4965fa7eb5c7257cd232f..6aa7f159e3392b98c831e0ab26c108a5bafea73d 100644
--- a/net/quic/quic_flags.cc
+++ b/net/quic/quic_flags.cc
@@ -19,12 +19,6 @@ bool FLAGS_track_retransmission_history = false;
 // request pacing for the server to enable it.
 bool FLAGS_enable_quic_pacing = true;
 
-// Do not remove this flag until b/11792453 is marked as Fixed.
-// If true, turns on connection level flow control in QUIC.
-// If this is disabled, all in flight QUIC connections talking QUIC_VERSION_19
-// or higher will timeout. New connections will be fine.
-bool FLAGS_enable_quic_connection_flow_control_2 = true;
-
 bool FLAGS_quic_allow_oversized_packets_for_test = false;
 
 // When true, the use time based loss detection instead of nack.