Deprecate FLAGS_quic_do_not_send_ack_on_emsgsize.

net/quic/core/quic_connection_test.cc

Index: net/quic/core/quic_connection_test.cc
diff --git a/net/quic/core/quic_connection_test.cc b/net/quic/core/quic_connection_test.cc
index be154ebefa86a2c21a17152680054d142dd2ebe9..428fb0e9902575ef3a275668a11241d559ace11d 100644
--- a/net/quic/core/quic_connection_test.cc
+++ b/net/quic/core/quic_connection_test.cc
@@ -5211,26 +5211,7 @@ TEST_P(QuicConnectionTest, NotBecomeApplicationLimitedDueToWriteBlock) {
   connection_.SendStreamData3();
 }
 
-TEST_P(QuicConnectionTest, ForceSendingAckOnPacketTooLarge) {
-  FLAGS_quic_do_not_send_ack_on_emsgsize = false;
-  EXPECT_CALL(visitor_, OnSuccessfulVersionNegotiation(_));
-  // Send an ack by simulating delayed ack alarm firing.
-  ProcessPacket(kDefaultPathId, 1);
-  QuicAlarm* ack_alarm = QuicConnectionPeer::GetAckAlarm(&connection_);
-  EXPECT_TRUE(ack_alarm->IsSet());
-  connection_.GetAckAlarm()->Fire();
-  // Simulate data packet causes write error.
-  EXPECT_CALL(visitor_, OnConnectionClosed(QUIC_PACKET_WRITE_ERROR, _, _));
-  SimulateNextPacketTooLarge();
-  connection_.SendStreamDataWithString(3, "foo", 0, !kFin, nullptr);
-  EXPECT_EQ(3u, writer_->frame_count());
-  EXPECT_FALSE(writer_->connection_close_frames().empty());
-  // Ack frame is bundled.
-  EXPECT_FALSE(writer_->ack_frames().empty());
-}
-
 TEST_P(QuicConnectionTest, DonotForceSendingAckOnPacketTooLarge) {
-  FLAGS_quic_do_not_send_ack_on_emsgsize = true;
   EXPECT_CALL(visitor_, OnSuccessfulVersionNegotiation(_));
   // Send an ack by simulating delayed ack alarm firing.
   ProcessPacket(kDefaultPathId, 1);