Deprecate quic_send_key_update_not_yet_supported

PiperOrigin-RevId: 335475670
Change-Id: I290513326c1df255b926cea45fcf042a7057b929

quic/core/quic_config.cc

diff --git a/quic/core/quic_config.cc b/quic/core/quic_config.cc
index bac4e18..0d1cd27 100644
--- a/quic/core/quic_config.cc
+++ b/quic/core/quic_config.cc
@@ -1228,10 +1228,7 @@
     params->google_connection_options = connection_options_.GetSendValues();
   }
 
-  if (GetQuicReloadableFlag(quic_send_key_update_not_yet_supported)) {
-    QUIC_RELOADABLE_FLAG_COUNT(quic_send_key_update_not_yet_supported);
-    params->key_update_not_yet_supported = true;
-  }
+  params->key_update_not_yet_supported = true;
 
   params->custom_parameters = custom_transport_parameters_to_send_;
 

quic/core/quic_config_test.cc

diff --git a/quic/core/quic_config_test.cc b/quic/core/quic_config_test.cc
index dad2423..4622a6e 100644
--- a/quic/core/quic_config_test.cc
+++ b/quic/core/quic_config_test.cc
@@ -505,8 +505,7 @@
   EXPECT_EQ(
       static_cast<uint64_t>(kDefaultMinAckDelayTimeMs) * kNumMicrosPerMilli,
       params.min_ack_delay_us.value());
-  EXPECT_EQ(params.key_update_not_yet_supported,
-            GetQuicReloadableFlag(quic_send_key_update_not_yet_supported));
+  EXPECT_TRUE(params.key_update_not_yet_supported);
 }
 
 TEST_P(QuicConfigTest, ProcessTransportParametersServer) {