gfe-relnote: Deprecate gfe2_reloadable_flag_quic_no_window_update_if_disconnected.

PiperOrigin-RevId: 301165323
Change-Id: I5245e119231a1649f6ccc2e438fa1ab9c467bdbf

quic/core/quic_flow_controller.cc

diff --git a/quic/core/quic_flow_controller.cc b/quic/core/quic_flow_controller.cc
index ccd3bfb..625cf46 100644
--- a/quic/core/quic_flow_controller.cc
+++ b/quic/core/quic_flow_controller.cc
@@ -192,9 +192,7 @@
 }
 
 void QuicFlowController::MaybeSendWindowUpdate() {
-  if (GetQuicReloadableFlag(quic_no_window_update_if_disconnected) &&
-      !session_->connection()->connected()) {
-    QUIC_RELOADABLE_FLAG_COUNT(quic_no_window_update_if_disconnected);
+  if (!session_->connection()->connected()) {
     return;
   }
   // Send WindowUpdate to increase receive window if