Fix timeout in url_request_quic_perftest.cc

This test hangs after crrev.com/518838 which added a new quic config option.
This is the build where the test first started failing:
https://ci.chromium.org/buildbot/chromium.perf/Linux%20Perf/2054

Bug: 788771
Change-Id: I5197a98612fc9c4f83655643b2e845b2c5477f0d
Reviewed-on: https://chromium-review.googlesource.com/803950
Reviewed-by: Ryan Hamilton <rch@chromium.org>
Commit-Queue: Helen Li <xunjieli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521214}

net/url_request/url_request_quic_perftest.cc

@@ -112,6 +112,7 @@ class URLRequestQuicPerfTest : public ::testing::Test {
         new HttpNetworkSession::Params);
     params->enable_quic = true;
     params->enable_user_alternate_protocol_ports = true;
+    params->quic_allow_remote_alt_svc = true;
     context_->set_host_resolver(host_resolver_.get());
     context_->set_http_network_session_params(std::move(params));
     context_->set_cert_verifier(&cert_verifier_);