Removes QUIC flag and code that shifts cubic epoch on quiescence, since it's buggy and should not b…

net/quic/core/congestion_control/tcp_cubic_sender_packets_test.cc

Index: net/quic/core/congestion_control/tcp_cubic_sender_packets_test.cc
diff --git a/net/quic/core/congestion_control/tcp_cubic_sender_packets_test.cc b/net/quic/core/congestion_control/tcp_cubic_sender_packets_test.cc
index 91bcea238cd6df23ccc521c8a3543ac8ad1e7c8d..2e3d54479d6e492addd0db2bb0e0a1f7900e22ff 100644
--- a/net/quic/core/congestion_control/tcp_cubic_sender_packets_test.cc
+++ b/net/quic/core/congestion_control/tcp_cubic_sender_packets_test.cc
@@ -644,49 +644,6 @@ TEST_F(TcpCubicSenderPacketsTest, TcpCubicResetEpochOnQuiescence) {
   EXPECT_GT(kMaxCongestionWindowBytes, sender_->GetCongestionWindow());
 }
 
-TEST_F(TcpCubicSenderPacketsTest, TcpCubicShiftedEpochOnQuiescence) {
-  FLAGS_shift_quic_cubic_epoch_when_app_limited = true;
-  const int kMaxCongestionWindow = 50;
-  const QuicByteCount kMaxCongestionWindowBytes =
-      kMaxCongestionWindow * kDefaultTCPMSS;
-  sender_.reset(
-      new TcpCubicSenderPacketsPeer(&clock_, false, kMaxCongestionWindow));
-
-  int num_sent = SendAvailableSendWindow();
-
-  // Make sure we fall out of slow start.
-  QuicByteCount saved_cwnd = sender_->GetCongestionWindow();
-  LoseNPackets(1);
-  EXPECT_GT(saved_cwnd, sender_->GetCongestionWindow());
-
-  // Ack the rest of the outstanding packets to get out of recovery.
-  for (int i = 1; i < num_sent; ++i) {
-    AckNPackets(1);
-  }
-  EXPECT_EQ(0u, bytes_in_flight_);
-
-  // Send a new window of data and ack all; cubic growth should occur.
-  saved_cwnd = sender_->GetCongestionWindow();
-  num_sent = SendAvailableSendWindow();
-  for (int i = 0; i < num_sent; ++i) {
-    AckNPackets(1);
-  }
-  EXPECT_LT(saved_cwnd, sender_->GetCongestionWindow());
-  EXPECT_GT(kMaxCongestionWindowBytes, sender_->GetCongestionWindow());
-  EXPECT_EQ(0u, bytes_in_flight_);
-
-  // Quiescent time of 100 seconds
-  clock_.AdvanceTime(QuicTime::Delta::FromSeconds(100));
-
-  // Send new window of data and ack one packet. Cubic epoch should have
-  // been reset; ensure cwnd increase is not dramatic.
-  saved_cwnd = sender_->GetCongestionWindow();
-  SendAvailableSendWindow();
-  AckNPackets(1);
-  EXPECT_NEAR(saved_cwnd, sender_->GetCongestionWindow(), kDefaultTCPMSS);
-  EXPECT_GT(kMaxCongestionWindowBytes, sender_->GetCongestionWindow());
-}
-
 TEST_F(TcpCubicSenderPacketsTest, MultipleLossesInOneWindow) {
   SendAvailableSendWindow();
   const QuicByteCount initial_window = sender_->GetCongestionWindow();