Rollback FLAGS_enable_quic_connection_flow_control due to bug in latest

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 8a4ed13ed60e4a1f390d07f2ef3a547f05899222..50a75890507387b73fb7d3f31b08e4e2e6301ec0 100644
--- a/net/quic/quic_flags.cc
+++ b/net/quic/quic_flags.cc
@@ -30,7 +30,8 @@ bool FLAGS_enable_quic_stream_flow_control_2 = true;
 // 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 = true;
+// Disabled due to b/15084203.
+bool FLAGS_enable_quic_connection_flow_control = false;
 
 bool FLAGS_quic_allow_oversized_packets_for_test = false;