Fix Tests/QuicEndToEndTest on iOS10 SDK

Temporarilly set FLAGS_quic_enable_version_35, FLAGS_quic_enable_version_36 and
FLAGS_quic_enable_version_36_v2 to true.

BUG=642709
TBR=rch

Review-Url: https://codereview.chromium.org/2301623002
Cr-Commit-Position: refs/heads/master@{#415758}

net/quic/chromium/quic_end_to_end_unittest.cc

@@ -107,6 +107,13 @@ class QuicEndToEndTest : public ::testing::TestWithParam<TestParams> {
         auth_handler_factory_(
             HttpAuthHandlerFactory::CreateDefault(&host_resolver_)),
         strike_register_no_startup_period_(false) {
+    // TODO(crbug.com/642709) These values are currently needed to avoid test
+    // test failures on iOS10.  It's unclear why this is happenening, and should
+    // be removed after investigation.
+    FLAGS_quic_enable_version_35 = true;
+    FLAGS_quic_enable_version_36 = true;
+    FLAGS_quic_enable_version_36_v2 = true;
+
     request_.method = "GET";
     request_.url = GURL("https://test.example.com/");
     request_.load_flags = 0;