Make HttpNetworkSession::host_mapping_rules no longer a pointer.

net/url_request/url_request_context_builder.cc

 // 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.
 
 #include "net/url_request/url_request_context_builder.h"
 
 #include <string>
 #include <utility>
 #include <vector>
 
@@ skipping 174 matching lines @@
 };
 
 }  // namespace
 
 URLRequestContextBuilder::HttpCacheParams::HttpCacheParams()
     : type(IN_MEMORY),
       max_size(0) {}
 URLRequestContextBuilder::HttpCacheParams::~HttpCacheParams() {}
 
 URLRequestContextBuilder::HttpNetworkSessionParams::HttpNetworkSessionParams()
-    : host_mapping_rules(nullptr),
-      ignore_certificate_errors(false),
+    : ignore_certificate_errors(false),
       testing_fixed_http_port(0),
       testing_fixed_https_port(0),
       enable_http2(true),
       enable_quic(false),
       quic_max_server_configs_stored_in_properties(0),
       quic_close_sessions_on_ip_change(false),
       quic_idle_connection_timeout_seconds(kIdleConnectionTimeoutSeconds),
       quic_migrate_sessions_on_network_change(false),
       quic_migrate_sessions_early(false),
       quic_disable_bidirectional_streams(false),
@@ skipping 333 matching lines @@
     std::unique_ptr<ProxyConfigService> proxy_config_service,
     URLRequestContext* url_request_context,
     HostResolver* host_resolver,
     NetworkDelegate* network_delegate,
     NetLog* net_log) {
   return ProxyService::CreateUsingSystemProxyResolver(
       std::move(proxy_config_service), net_log);
 }
 
 }  // namespace net