Enable simplify stop waiting in quic http EndToEndTests

gfe-relnote: n/a (test-only change)
PiperOrigin-RevId: 265611721
Change-Id: I51bbcab7c05572ddd751e718b99180f415aed142

quic/core/http/end_to_end_test.cc

diff --git a/quic/core/http/end_to_end_test.cc b/quic/core/http/end_to_end_test.cc
index 89cf9ca..14d2e7b 100644
--- a/quic/core/http/end_to_end_test.cc
+++ b/quic/core/http/end_to_end_test.cc
@@ -236,6 +236,7 @@
         support_server_push_(false),
         expected_server_connection_id_length_(kQuicDefaultConnectionIdLength) {
     SetQuicFlag(FLAGS_quic_supports_tls_handshake, true);
+    SetQuicReloadableFlag(quic_simplify_stop_waiting, true);
     client_supported_versions_ = GetParam().client_supported_versions;
     server_supported_versions_ = GetParam().server_supported_versions;
     negotiated_version_ = GetParam().negotiated_version;