gfe-relnote: (n/a) Deprecate --gfe2_reloadable_flag_quic_batch_writer_flush_after_mtu_probe.

PiperOrigin-RevId: 301254788
Change-Id: Ided83b7d8b093ae82dee9a41dac922d3856a86ef

quic/core/quic_connection.cc

diff --git a/quic/core/quic_connection.cc b/quic/core/quic_connection.cc
index c067f7a..daf5031 100644
--- a/quic/core/quic_connection.cc
+++ b/quic/core/quic_connection.cc
@@ -331,9 +331,7 @@
       max_consecutive_ptos_(0),
       bytes_received_before_address_validation_(0),
       bytes_sent_before_address_validation_(0),
-      address_validated_(false),
-      batch_writer_flush_after_mtu_probe_(
-          GetQuicReloadableFlag(quic_batch_writer_flush_after_mtu_probe)) {
+      address_validated_(false) {
   QUIC_DLOG(INFO) << ENDPOINT << "Created connection with server connection ID "
                   << server_connection_id
                   << " and version: " << ParsedQuicVersionToString(version());
@@ -2264,9 +2262,7 @@
       // be closed. By manually flush the writer here, the MTU probe is sent in
       // a normal(non-GSO) packet, so the kernel can return EMSGSIZE and we will
       // not close the connection.
-      if (batch_writer_flush_after_mtu_probe_ && is_mtu_discovery &&
-          writer_->IsBatchMode()) {
-        QUIC_RELOADABLE_FLAG_COUNT(quic_batch_writer_flush_after_mtu_probe);
+      if (is_mtu_discovery && writer_->IsBatchMode()) {
         result = writer_->Flush();
       }
       break;

quic/core/quic_connection.h

diff --git a/quic/core/quic_connection.h b/quic/core/quic_connection.h
index 8cb1d37..f35aa05 100644
--- a/quic/core/quic_connection.h
+++ b/quic/core/quic_connection.h
@@ -1545,9 +1545,6 @@
   QuicCoalescedPacket coalesced_packet_;
 
   QuicConnectionMtuDiscoverer mtu_discoverer_;
-
-  // Latched value of quic_batch_writer_flush_after_mtu_probe.
-  const bool batch_writer_flush_after_mtu_probe_;
 };
 
 }  // namespace quic

quic/core/quic_connection_test.cc

diff --git a/quic/core/quic_connection_test.cc b/quic/core/quic_connection_test.cc
index 007856b..cb2583e 100644
--- a/quic/core/quic_connection_test.cc
+++ b/quic/core/quic_connection_test.cc
@@ -5024,9 +5024,7 @@
   const uint32_t prior_flush_attempts = writer_->flush_attempts();
   connection_.SendMtuDiscoveryPacket(target_mtu);
   EXPECT_EQ(target_mtu, mtu_probe_size);
-  if (GetQuicReloadableFlag(quic_batch_writer_flush_after_mtu_probe)) {
-    EXPECT_EQ(writer_->flush_attempts(), prior_flush_attempts + 1);
-  }
+  EXPECT_EQ(writer_->flush_attempts(), prior_flush_attempts + 1);
 }
 
 // Tests whether MTU discovery does not happen when it is not explicitly enabled