gfe-relnote: Deprecate gfe2_reloadable_flag_quic_fix_termination_packets.

PiperOrigin-RevId: 248178442
Change-Id: I91a948b3cf5f91d0e98c6b4abb10ff67db3d08fc

quic/core/http/end_to_end_test.cc

diff --git a/quic/core/http/end_to_end_test.cc b/quic/core/http/end_to_end_test.cc
index 85ae602..f301428 100644
--- a/quic/core/http/end_to_end_test.cc
+++ b/quic/core/http/end_to_end_test.cc
@@ -3753,7 +3753,6 @@
 TEST_P(EndToEndTest, ForwardSecureConnectionClose) {
   // This test ensures ZERO_RTT_PROTECTED connection close is sent to a client
   // which has ZERO_RTT_PROTECTED encryption level.
-  SetQuicReloadableFlag(quic_fix_termination_packets, true);
   connect_to_server_on_initialize_ =
       negotiated_version_.transport_version <= QUIC_VERSION_43;
   ASSERT_TRUE(Initialize());

quic/core/quic_connection.cc

diff --git a/quic/core/quic_connection.cc b/quic/core/quic_connection.cc
index 6798f63..b30c5f0 100644
--- a/quic/core/quic_connection.cc
+++ b/quic/core/quic_connection.cc
@@ -346,8 +346,6 @@
       supports_release_time_(false),
       release_time_into_future_(QuicTime::Delta::Zero()),
       no_version_negotiation_(supported_versions.size() == 1),
-      fix_termination_packets_(
-          GetQuicReloadableFlag(quic_fix_termination_packets)),
       send_ack_when_on_can_write_(false),
       retry_has_been_parsed_(false),
       validate_packet_number_post_decryption_(
@@ -3085,10 +3083,7 @@
 void QuicConnection::SendConnectionClosePacket(QuicErrorCode error,
                                                const std::string& details) {
   QUIC_DLOG(INFO) << ENDPOINT << "Sending connection close packet.";
-  if (fix_termination_packets_) {
-    QUIC_RELOADABLE_FLAG_COUNT(quic_fix_termination_packets);
-    SetDefaultEncryptionLevel(GetConnectionCloseEncryptionLevel());
-  }
+  SetDefaultEncryptionLevel(GetConnectionCloseEncryptionLevel());
   ClearQueuedPackets();
   // If there was a packet write error, write the smallest close possible.
   AckBundling ack_mode = (error == QUIC_PACKET_WRITE_ERROR) ? NO_ACK : SEND_ACK;
@@ -4008,7 +4003,6 @@
 }
 
 EncryptionLevel QuicConnection::GetConnectionCloseEncryptionLevel() const {
-  DCHECK(fix_termination_packets_);
   if (perspective_ == Perspective::IS_CLIENT) {
     return encryption_level_;
   }

quic/core/quic_connection.h

diff --git a/quic/core/quic_connection.h b/quic/core/quic_connection.h
index 47816de..413a582 100644
--- a/quic/core/quic_connection.h
+++ b/quic/core/quic_connection.h
@@ -1503,9 +1503,6 @@
   // vector to improve performance since it is expected to be very small.
   std::vector<QuicConnectionId> incoming_connection_ids_;
 
-  // Latched value of quic_fix_termination_packets.
-  const bool fix_termination_packets_;
-
   // Indicates whether an ACK needs to be sent in OnCanWrite(). Only used when
   // deprecate_ack_bundling_mode is true.
   // TODO(fayang): Remove this when ACK sending logic is moved to received