deprecate FLAGS_graceful_emsgsize_on_mtu_probe

net/quic/core/quic_connection.cc

Index: net/quic/core/quic_connection.cc
diff --git a/net/quic/core/quic_connection.cc b/net/quic/core/quic_connection.cc
index 47944a2c162d14db1481bcb4b4ac8654e666a63e..6fe21cf33f6a76093dfe9f94f58e0e909d943b1f 100644
--- a/net/quic/core/quic_connection.cc
+++ b/net/quic/core/quic_connection.cc
@@ -1699,8 +1699,7 @@ bool QuicConnection::WritePacket(SerializedPacket* packet) {
   if (FLAGS_quic_only_track_sent_packets) {
     // In some cases, an MTU probe can cause EMSGSIZE. This indicates that the
     // MTU discovery is permanently unsuccessful.
-    if (FLAGS_graceful_emsgsize_on_mtu_probe &&
-        result.status == WRITE_STATUS_ERROR &&
+    if (result.status == WRITE_STATUS_ERROR &&
         result.error_code == kMessageTooBigErrorCode &&
         packet->retransmittable_frames.empty() &&
         packet->encrypted_length > long_term_mtu_) {
@@ -1769,8 +1768,7 @@ bool QuicConnection::WritePacket(SerializedPacket* packet) {
   if (!FLAGS_quic_only_track_sent_packets) {
     // In some cases, an MTU probe can cause EMSGSIZE. This indicates that the
     // MTU discovery is permanently unsuccessful.
-    if (FLAGS_graceful_emsgsize_on_mtu_probe &&
-        result.status == WRITE_STATUS_ERROR &&
+    if (result.status == WRITE_STATUS_ERROR &&
         result.error_code == kMessageTooBigErrorCode &&
         packet->retransmittable_frames.empty() &&
         packet->encrypted_length > long_term_mtu_) {