Revert "Enable QUIC v41 by default"

This reverts commit 1e31ca06.

Reason for revert: v41 is going to be deprecated

Original change's description:
> Enable QUIC v41 by default
> 
> Change-Id: I12c2ce5551bcd2630af75ac9e9f6e15758c3a7e6
> Reviewed-on: https://chromium-review.googlesource.com/889639
> Commit-Queue: Ryan Hamilton <rch@chromium.org>
> Reviewed-by: Buck Krasic <ckrasic@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#532785}

TBR=rch@chromium.org,ckrasic@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Change-Id: I932329a83dc70e7da7ba8750a87e4e7e71cd544a
Reviewed-on: https://chromium-review.googlesource.com/900102Reviewed-by: Ryan Hamilton <rch@chromium.org>
Reviewed-by: Jana Iyengar <jri@chromium.org>
Commit-Queue: Ryan Hamilton <rch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534208}

net/http/http_network_session.cc

@@ -140,7 +140,7 @@ HttpNetworkSession::Params::Params()
       enable_token_binding(false),
       http_09_on_non_default_ports_enabled(false),
       disable_idle_sockets_close_on_memory_pressure(false) {
-  quic_supported_versions.push_back(QUIC_VERSION_41);
+  quic_supported_versions.push_back(QUIC_VERSION_39);
 }
 
 HttpNetworkSession::Params::Params(const Params& other) = default;

net/http/http_server_properties_manager_unittest.cc

@@ -1373,7 +1373,7 @@ TEST_P(HttpServerPropertiesManagerTest, PersistAdvertisedVersionsToPref) {
       "\"expiration\":\"13758804000000000\",\"host\":\"www.google.com\","
       "\"port\":1234,\"protocol_str\":\"h2\"}]}},"
       "{\"https://mail.google.com:80\":{\"alternative_service\":[{"
-      "\"advertised_versions\":[41],\"expiration\":\"9223372036854775807\","
+      "\"advertised_versions\":[39],\"expiration\":\"9223372036854775807\","
       "\"host\":\"foo.google.com\",\"port\":444,\"protocol_str\":\"quic\"}],"
       "\"network_stats\":{\"srtt\":42}}}],\"supports_quic\":{"
       "\"address\":\"127.0.0.1\",\"used_quic\":true},\"version\":5}";
@@ -1470,7 +1470,7 @@ TEST_P(HttpServerPropertiesManagerTest,
       "{\"quic_servers\":{\"https://mail.google.com:80\":"
       "{\"server_info\":\"quic_server_info1\"}},\"servers\":["
       "{\"https://www.google.com:80\":"
-      "{\"alternative_service\":[{\"advertised_versions\":[41],"
+      "{\"alternative_service\":[{\"advertised_versions\":[39],"
       "\"expiration\":\"13756212000000000\",\"port\":443,"
       "\"protocol_str\":\"quic\"}]}}],\"supports_quic\":"
       "{\"address\":\"127.0.0.1\",\"used_quic\":true},\"version\":5}";