Deprecate FLAGS_quic_close_connection_on_packet_too_large.

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 1cacb4956c2ef15286e33e12662e036c8368cedc..3e82f28a1ee0140d632174034025817774b85f14 100644
--- a/net/quic/core/quic_connection.cc
+++ b/net/quic/core/quic_connection.cc
@@ -1759,7 +1759,7 @@ bool QuicConnection::ShouldDiscardPacket(const SerializedPacket& packet) {
 }
 
 void QuicConnection::OnWriteError(int error_code) {
-  if (FLAGS_quic_close_connection_on_packet_too_large && write_error_occured_) {
+  if (write_error_occured_) {
     // A write error already occurred. The connection is being closed.
     return;
   }
@@ -1772,12 +1772,10 @@ void QuicConnection::OnWriteError(int error_code) {
   // We can't send an error as the socket is presumably borked.
   switch (error_code) {
     case kMessageTooBigErrorCode:
-      if (FLAGS_quic_close_connection_on_packet_too_large) {  // NOLINT
-        CloseConnection(
-            QUIC_PACKET_WRITE_ERROR, error_details,
-            ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET_WITH_NO_ACK);
-        break;
-      }
+      CloseConnection(
+          QUIC_PACKET_WRITE_ERROR, error_details,
+          ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET_WITH_NO_ACK);
+      break;
     default:
       // We can't send an error as the socket is presumably borked.
       TearDownLocalConnectionState(QUIC_PACKET_WRITE_ERROR, error_details,