net: plumb DnsRRResolver from IOThread to HttpNetworkSession.

chrome/browser/net/chrome_url_request_context.h

 // Copyright (c) 2010 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.
 
 #ifndef CHROME_BROWSER_NET_CHROME_URL_REQUEST_CONTEXT_H_
 #define CHROME_BROWSER_NET_CHROME_URL_REQUEST_CONTEXT_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 109 matching lines @@
   void set_transport_security_state(
       net::TransportSecurityState* state) {
     transport_security_state_ = state;
   }
   void set_ssl_config_service(net::SSLConfigService* service) {
     ssl_config_service_ = service;
   }
   void set_host_resolver(net::HostResolver* resolver) {
     host_resolver_ = resolver;
   }
+  void set_dnsrr_resolver(net::DnsRRResolver* dnsrr_resolver) {
+    dnsrr_resolver_ = dnsrr_resolver;
+  }
   void set_http_transaction_factory(net::HttpTransactionFactory* factory) {
     http_transaction_factory_ = factory;
   }
   void set_ftp_transaction_factory(net::FtpTransactionFactory* factory) {
     ftp_transaction_factory_ = factory;
   }
   void set_http_auth_handler_factory(net::HttpAuthHandlerFactory* factory) {
     http_auth_handler_factory_ = factory;
   }
   void set_cookie_store(net::CookieStore* cookie_store) {
@@ skipping 233 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(ChromeURLRequestContextFactory);
 };
 
 // Creates a proxy configuration from proxy-related preferences fetched
 // from |pref_service|. The relevant preferences in |pref_service| are
 // initialized from the process' command line or by applicable proxy policies.
 net::ProxyConfig* CreateProxyConfig(const PrefService* pref_service);
 
 #endif  // CHROME_BROWSER_NET_CHROME_URL_REQUEST_CONTEXT_H_