Fix test which times out when FLAGS_quic_allow_more_open_streams is

net/quic/quic_session_test.cc

Index: net/quic/quic_session_test.cc
diff --git a/net/quic/quic_session_test.cc b/net/quic/quic_session_test.cc
index 1522f201d7d245ce10719d4262c824b76a6b8580..0a5032e70885846adb43ec89de5e6c7415a9c675 100644
--- a/net/quic/quic_session_test.cc
+++ b/net/quic/quic_session_test.cc
@@ -995,7 +995,8 @@ TEST_P(QuicSessionTest, WindowUpdateUnblocksHeadersStream) {
 TEST_P(QuicSessionTest, TooManyUnfinishedStreamsCauseConnectionClose) {
   // If a buggy/malicious peer creates too many streams that are not ended with
   // a FIN or RST then we send a connection close.
-  FLAGS_close_quic_connection_unfinished_streams_2 = true;
+  ValueRestore<bool> old_flag(&FLAGS_close_quic_connection_unfinished_streams_2,
+                              true);
 
   EXPECT_CALL(*connection_,
               SendConnectionClose(QUIC_TOO_MANY_UNFINISHED_STREAMS)).Times(1);