gfe-relnote: undeprecate gfe2_reloadable_flag_quic_create_incoming_stream_bug

gfe2_reloadable_flag_quic_create_incoming_stream_bug has been mistakenly
deprecated at the same time it was verified at cl/303999833.  This CL
undeprecates the flag while keeping it verified.

PiperOrigin-RevId: 304403085
Change-Id: I73d82607a31ce36eb020545e572317072f0ddf5a

quic/core/http/quic_spdy_client_session.cc

diff --git a/quic/core/http/quic_spdy_client_session.cc b/quic/core/http/quic_spdy_client_session.cc
index 48d21ea..07b9c7a 100644
--- a/quic/core/http/quic_spdy_client_session.cc
+++ b/quic/core/http/quic_spdy_client_session.cc
@@ -136,9 +136,23 @@
     return false;
   }
 
+  if (GetQuicReloadableFlag(quic_create_incoming_stream_bug)) {
+    if (QuicUtils::IsClientInitiatedStreamId(transport_version(), id)) {
+      QUIC_RELOADABLE_FLAG_COUNT_N(quic_create_incoming_stream_bug, 1, 2);
+      QUIC_BUG << "ShouldCreateIncomingStream called with client initiated "
+                  "stream ID.";
+      return false;
+    } else {
+      QUIC_RELOADABLE_FLAG_COUNT_N(quic_create_incoming_stream_bug, 2, 2);
+    }
+  }
+
   if (QuicUtils::IsClientInitiatedStreamId(transport_version(), id)) {
-    QUIC_BUG << "ShouldCreateIncomingStream called with client initiated "
-                "stream ID.";
+    QUIC_LOG(WARNING) << "Received invalid push stream id " << id;
+    connection()->CloseConnection(
+        QUIC_INVALID_STREAM_ID,
+        "Server created non write unidirectional stream",
+        ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET);
     return false;
   }