gfe-relnote: Deprecate gfe2_reloadable_flag_quic_no_window_update_on_read_only_stream.

PiperOrigin-RevId: 268038344
Change-Id: I27de4f7d4497c48c7147caab5f4918a01e615db5

quic/core/quic_stream.cc

diff --git a/quic/core/quic_stream.cc b/quic/core/quic_stream.cc
index c08688b..91ba580 100644
--- a/quic/core/quic_stream.cc
+++ b/quic/core/quic_stream.cc
@@ -746,9 +746,7 @@
 }
 
 void QuicStream::OnWindowUpdateFrame(const QuicWindowUpdateFrame& frame) {
-  if (GetQuicReloadableFlag(quic_no_window_update_on_read_only_stream) &&
-      type_ == READ_UNIDIRECTIONAL) {
-    QUIC_RELOADABLE_FLAG_COUNT(quic_no_window_update_on_read_only_stream);
+  if (type_ == READ_UNIDIRECTIONAL) {
     CloseConnectionWithDetails(
         QUIC_WINDOW_UPDATE_RECEIVED_ON_READ_UNIDIRECTIONAL_STREAM,
         "WindowUpdateFrame received on READ_UNIDIRECTIONAL stream.");

quic/core/quic_stream_test.cc

diff --git a/quic/core/quic_stream_test.cc b/quic/core/quic_stream_test.cc
index ff65db3..56b4da2 100644
--- a/quic/core/quic_stream_test.cc
+++ b/quic/core/quic_stream_test.cc
@@ -1694,7 +1694,6 @@
 }
 
 TEST_P(QuicStreamTest, WindowUpdateForReadOnlyStream) {
-  SetQuicReloadableFlag(quic_no_window_update_on_read_only_stream, true);
   Initialize();
 
   QuicStreamId stream_id = QuicUtils::GetFirstUnidirectionalStreamId(