gfe-relnote: (n/a) Deprecate --gfe2_reloadable_flag_quic_bbr2_cut_inflight_hi_gradually.

PiperOrigin-RevId: 295151763
Change-Id: I0b10ddcceef886241cc1a7fe6db4f37f58ee0d86

quic/core/congestion_control/bbr2_probe_bw.cc

diff --git a/quic/core/congestion_control/bbr2_probe_bw.cc b/quic/core/congestion_control/bbr2_probe_bw.cc
index e1cb58b..64240cf 100644
--- a/quic/core/congestion_control/bbr2_probe_bw.cc
+++ b/quic/core/congestion_control/bbr2_probe_bw.cc
@@ -172,20 +172,17 @@
 
       if (!send_state.is_app_limited) {
         QuicByteCount inflight_at_send = BytesInFlight(send_state);
-        if (GetQuicReloadableFlag(quic_bbr2_cut_inflight_hi_gradually)) {
-          QuicByteCount inflight_target =
-              sender_->GetTargetBytesInflight() * (1.0 - Params().beta);
-          if (inflight_at_send >= inflight_target) {
-            // The new code does not change behavior.
-            QUIC_CODE_COUNT(quic_bbr2_cut_inflight_hi_gradually_noop);
-          } else {
-            // The new code actually cuts inflight_hi slower than before.
-            QUIC_CODE_COUNT(quic_bbr2_cut_inflight_hi_gradually_in_effect);
-          }
-          model_->set_inflight_hi(std::max(inflight_at_send, inflight_target));
+
+        QuicByteCount inflight_target =
+            sender_->GetTargetBytesInflight() * (1.0 - Params().beta);
+        if (inflight_at_send >= inflight_target) {
+          // The new code does not change behavior.
+          QUIC_CODE_COUNT(quic_bbr2_cut_inflight_hi_gradually_noop);
         } else {
-          model_->set_inflight_hi(inflight_at_send);
+          // The new code actually cuts inflight_hi slower than before.
+          QUIC_CODE_COUNT(quic_bbr2_cut_inflight_hi_gradually_in_effect);
         }
+        model_->set_inflight_hi(std::max(inflight_at_send, inflight_target));
       }
 
       QUIC_DVLOG(3) << sender_ << " " << cycle_.phase

quic/core/congestion_control/bbr2_simulator_test.cc

diff --git a/quic/core/congestion_control/bbr2_simulator_test.cc b/quic/core/congestion_control/bbr2_simulator_test.cc
index 6e6fa86..d109d54 100644
--- a/quic/core/congestion_control/bbr2_simulator_test.cc
+++ b/quic/core/congestion_control/bbr2_simulator_test.cc
@@ -784,12 +784,7 @@
       {LostPacket(next_packet_number - 2, kDefaultMaxPacketSize)});
 
   QuicByteCount inflight_hi = sender_->ExportDebugState().inflight_hi;
-  if (GetQuicReloadableFlag(quic_bbr2_cut_inflight_hi_gradually)) {
-    EXPECT_LT(2 * kDefaultMaxPacketSize, inflight_hi);
-  } else {
-    // Bytes inflight at send.
-    EXPECT_EQ(2 * kDefaultMaxPacketSize, inflight_hi);
-  }
+  EXPECT_LT(2 * kDefaultMaxPacketSize, inflight_hi);
 }
 
 // All Bbr2MultiSenderTests uses the following network topology: