Deprecate --gfe2_reloadable_flag_quic_process_undecryptable_packets_after_async_decrypt_callback.

PiperOrigin-RevId: 346094135
Change-Id: I389f9da93c6fa4d1ac919c7bcc6a96fa4012f54a

quic/core/quic_flags_list.h

diff --git a/quic/core/quic_flags_list.h b/quic/core/quic_flags_list.h
index ef27e46..cb4ec93 100644
--- a/quic/core/quic_flags_list.h
+++ b/quic/core/quic_flags_list.h
@@ -45,7 +45,6 @@
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_let_connection_handle_pings, true)
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_new_priority_update_frame, true)
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_pass_path_response_to_validator, false)
-QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_process_undecryptable_packets_after_async_decrypt_callback, true)
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_require_handshake_confirmation, false)
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_round_up_tiny_bandwidth, true)
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_send_goaway_with_connection_close, true)

quic/core/tls_server_handshaker.cc

diff --git a/quic/core/tls_server_handshaker.cc b/quic/core/tls_server_handshaker.cc
index 93f6c58..83d160f 100644
--- a/quic/core/tls_server_handshaker.cc
+++ b/quic/core/tls_server_handshaker.cc
@@ -233,11 +233,7 @@
 
 void TlsServerHandshaker::AdvanceHandshakeFromCallback() {
   AdvanceHandshake();
-  if (GetQuicReloadableFlag(
-          quic_process_undecryptable_packets_after_async_decrypt_callback) &&
-      !is_connection_closed()) {
-    QUIC_RELOADABLE_FLAG_COUNT(
-        quic_process_undecryptable_packets_after_async_decrypt_callback);
+  if (!is_connection_closed()) {
     handshaker_delegate()->OnHandshakeCallbackDone();
   }
 }