Disable SPDY/3.1.

net/url_request/url_request_context_builder.cc

Index: net/url_request/url_request_context_builder.cc
diff --git a/net/url_request/url_request_context_builder.cc b/net/url_request/url_request_context_builder.cc
index 02328d632a8cadbf6dfbd2b34d30c45fced90b42..3f93b3eadd08664faa02b7b0ea5137bb59b2dabe 100644
--- a/net/url_request/url_request_context_builder.cc
+++ b/net/url_request/url_request_context_builder.cc
@@ -182,7 +182,6 @@ URLRequestContextBuilder::HttpNetworkSessionParams::HttpNetworkSessionParams()
       host_mapping_rules(NULL),
       testing_fixed_http_port(0),
       testing_fixed_https_port(0),
-      enable_spdy31(false),
       enable_http2(true),
       enable_quic(false),
       quic_max_server_configs_stored_in_properties(0),
@@ -246,7 +245,6 @@ void URLRequestContextBuilder::DisableHttpCache() {
 
 void URLRequestContextBuilder::SetSpdyAndQuicEnabled(bool spdy_enabled,
                                                      bool quic_enabled) {
-  http_network_session_params_.enable_spdy31 = spdy_enabled;
   http_network_session_params_.enable_http2 = spdy_enabled;
   http_network_session_params_.enable_quic = quic_enabled;
 }
@@ -414,8 +412,6 @@ std::unique_ptr<URLRequestContext> URLRequestContextBuilder::Build() {
       http_network_session_params_.testing_fixed_http_port;
   network_session_params.testing_fixed_https_port =
       http_network_session_params_.testing_fixed_https_port;
-  network_session_params.enable_spdy31 =
-      http_network_session_params_.enable_spdy31;
   network_session_params.enable_http2 =
       http_network_session_params_.enable_http2;
   network_session_params.enable_quic = http_network_session_params_.enable_quic;