Disable SPDY/3.1.

net/url_request/url_request_context_builder.h

 // 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.
 
 // This class is useful for building a simple URLRequestContext. Most creators
 // of new URLRequestContexts should use this helper class to construct it. Call
 // any configuration params, and when done, invoke Build() to construct the
 // URLRequestContext. This URLRequestContext will own all its own storage.
 //
 // URLRequestContextBuilder and its associated params classes are initially
@@ skipping 72 matching lines @@
 
   struct NET_EXPORT HttpNetworkSessionParams {
     HttpNetworkSessionParams();
     ~HttpNetworkSessionParams();
 
     // These fields mirror those in HttpNetworkSession::Params;
     bool ignore_certificate_errors;
     HostMappingRules* host_mapping_rules;
     uint16_t testing_fixed_http_port;
     uint16_t testing_fixed_https_port;
-    bool enable_spdy31;
     bool enable_http2;
     bool enable_quic;
     std::string quic_user_agent_id;
     int quic_max_server_configs_stored_in_properties;
     bool quic_delay_tcp_race;
     int quic_max_number_of_lossy_connections;
     std::unordered_set<std::string> quic_host_whitelist;
     bool quic_prefer_aes;
     float quic_packet_loss_threshold;
     int quic_idle_connection_timeout_seconds;
@@ skipping 274 matching lines @@
   // Not owned by the context builder. Once it is set to a non-null value, it
   // is guaranteed to be non-null during the lifetime of |this|.
   SocketPerformanceWatcherFactory* socket_performance_watcher_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(URLRequestContextBuilder);
 };
 
 }  // namespace net
 
 #endif  // NET_URL_REQUEST_URL_REQUEST_CONTEXT_BUILDER_H_