Enable end-to-end tests for QUIC stateless rejects when they will not involve version negotiation.

net/tools/quic/end_to_end_test.cc

Index: net/tools/quic/end_to_end_test.cc
diff --git a/net/tools/quic/end_to_end_test.cc b/net/tools/quic/end_to_end_test.cc
index 8a3f0ca7ec7104f8a6c813ed3a0eb9cffb4df256..ae8ef09967d64b57f7197cdb6cba19c67dbbf225 100644
--- a/net/tools/quic/end_to_end_test.cc
+++ b/net/tools/quic/end_to_end_test.cc
@@ -164,10 +164,9 @@ vector<TestParams> GetTestParams() {
       for (const QuicVersionVector& client_versions : client_version_buckets) {
         // A number of end to end tests fail when stateless rejects are enabled
         // *and* there are more than two QUIC versions.
-        // TODO(b/23745998) Re-enable client stateless reject support.
-        for (bool client_supports_stateless_rejects : {false}) {
-          // TODO(b/23745998) Re-enable server stateless reject support.
-          for (bool server_uses_stateless_rejects_if_peer_supported : {false}) {
+        for (bool client_supports_stateless_rejects : {true, false}) {
+          for (bool server_uses_stateless_rejects_if_peer_supported :
+               {true, false}) {
             for (bool auto_tune_flow_control_window : {true, false}) {
               CHECK(!client_versions.empty());
               // Add an entry for server and client supporting all versions.
@@ -177,6 +176,12 @@ vector<TestParams> GetTestParams() {
                   client_supports_stateless_rejects,
                   server_uses_stateless_rejects_if_peer_supported,
                   congestion_control_tag, auto_tune_flow_control_window));
+              if (client_supports_stateless_rejects &&
+                  server_uses_stateless_rejects_if_peer_supported) {
+                // TODO(b/23745998) Make stateless reject work with version
+                // negotiation.
+                continue;
+              }
 
               // Test client supporting all versions and server supporting 1
               // version. Simulate an old server and exercise version downgrade