[M54 merge] Disables QUIC flag that shifts cubic epoch on quiescence, since shifting code is buggy …

net/quic/core/quic_flags.cc

Index: net/quic/core/quic_flags.cc
diff --git a/net/quic/core/quic_flags.cc b/net/quic/core/quic_flags.cc
index 68c391dff7a4aa558e43c816e6f5b11c9a34642f..dfb36d29f5408284e9794f931fb4006fbcaa5cf8 100644
--- a/net/quic/core/quic_flags.cc
+++ b/net/quic/core/quic_flags.cc
@@ -42,7 +42,7 @@ bool FLAGS_quic_enable_multipath = false;
 bool FLAGS_quic_require_handshake_confirmation = false;
 
 // If true, Cubic's epoch is shifted when the sender is application-limited.
-bool FLAGS_shift_quic_cubic_epoch_when_app_limited = true;
+bool FLAGS_shift_quic_cubic_epoch_when_app_limited = false;
 
 // If true, QUIC will measure head of line (HOL) blocking due between
 // streams due to packet losses on the headers stream.  The