gfe-relnote: Deprecate gfe2_reloadable_flag_quic_enable_lifo_write_scheduler.

PiperOrigin-RevId: 292379022
Change-Id: I9e5d72e2fdd0ca9c8a338c302615a3528eecdf28

quic/core/quic_session.cc

diff --git a/quic/core/quic_session.cc b/quic/core/quic_session.cc
index b60109a..600e3f3 100644
--- a/quic/core/quic_session.cc
+++ b/quic/core/quic_session.cc
@@ -1030,13 +1030,10 @@
         // Enable FIFO write scheduler.
         write_blocked_streams_.SwitchWriteScheduler(
             spdy::WriteSchedulerType::FIFO, transport_version());
-      } else if (GetQuicReloadableFlag(quic_enable_lifo_write_scheduler) &&
-                 ContainsQuicTag(config_.ReceivedConnectionOptions(), kLIFO)) {
+      } else if (ContainsQuicTag(config_.ReceivedConnectionOptions(), kLIFO)) {
         // Enable LIFO write scheduler.
-        if (write_blocked_streams_.SwitchWriteScheduler(
-                spdy::WriteSchedulerType::LIFO, transport_version())) {
-          QUIC_RELOADABLE_FLAG_COUNT(quic_enable_lifo_write_scheduler);
-        }
+        write_blocked_streams_.SwitchWriteScheduler(
+            spdy::WriteSchedulerType::LIFO, transport_version());
       } else if (GetQuicReloadableFlag(quic_enable_rr_write_scheduler) &&
                  ContainsQuicTag(config_.ReceivedConnectionOptions(), kRRWS) &&
                  write_blocked_streams_.scheduler_type() ==