gfe-relnote: In QUIC, do not bother stream ID manager on stream closed if connection has already been closed. Protected by existing gfe2_reloadable_flag_quic_enable_version_t099 or gfe2_reloadable_flag_quic_enable_version_draft_25.

PiperOrigin-RevId: 296515430
Change-Id: I372a2bcfda88c702cd95bb162fb96b6cf7ce7ed2

quic/core/quic_session.cc

diff --git a/quic/core/quic_session.cc b/quic/core/quic_session.cc
index c78bb66..a47c265 100644
--- a/quic/core/quic_session.cc
+++ b/quic/core/quic_session.cc
@@ -922,7 +922,8 @@
   } else if (VersionHasIetfQuicFrames(transport_version())) {
     // Stream was not draining, but we did have a fin or rst, so we can now
     // free the stream ID if version 99.
-    if (had_fin_or_rst) {
+    if (had_fin_or_rst && connection_->connected()) {
+      // Do not bother informing stream ID manager if connection is closed.
       v99_streamid_manager_.OnStreamClosed(stream_id);
     }
   }