Fix QUIC end to end tests to actually run the individual params one at a time as the comment says.

net/tools/quic/end_to_end_test.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stddef.h>
 #include <sys/epoll.h>
 
 #include <list>
 #include <memory>
 #include <string>
@@ skipping 241 matching lines @@
                         client_versions.front(),
                         client_supports_stateless_rejects,
                         server_uses_stateless_rejects_if_peer_supported,
                         congestion_control_tag, disable_hpack_dynamic_table,
                         force_hol_blocking, use_cheap_stateless_reject,
                         buffer_packet_till_chlo, small_client_mtu));
 
                     // Run version negotiation tests tests with no options, or
                     // all the options enabled to avoid a combinatorial
                     // explosion.
-                    if (enabled_options > 0 &&
+                    if (enabled_options > 1 &&
                         enabled_options < kMaxEnabledOptions) {
                       continue;
                     }
 
                     // Test client supporting all versions and server supporting
                     // 1 version. Simulate an old server and exercise version
                     // downgrade in the client. Protocol negotiation should
                     // occur.  Skip the i = 0 case because it is essentially the
                     // same as the default case.
                     for (size_t i = 1; i < client_versions.size(); ++i) {
@@ skipping 2646 matching lines @@
   EXPECT_EQ(kBarResponseBody, client_->response_body());
   QuicConnectionStats client_stats =
       client_->client()->session()->connection()->GetStats();
   EXPECT_EQ(0u, client_stats.packets_lost);
   EXPECT_EQ(1, client_->client()->GetNumSentClientHellos());
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace net