net: plumb DnsRRResolver from IOThread to HttpNetworkSession.

net/http/http_network_session.cc

Index: net/http/http_network_session.cc
diff --git a/net/http/http_network_session.cc b/net/http/http_network_session.cc
index 7b4fe0e789a68b9b3d16b8998b12f87005215cdd..4613629855171383e9644d588668ae3edf92f316 100644
--- a/net/http/http_network_session.cc
+++ b/net/http/http_network_session.cc
@@ -20,6 +20,7 @@ namespace net {
 // TODO(mbelshe): Move the socket factories into HttpStreamFactory.
 HttpNetworkSession::HttpNetworkSession(
     HostResolver* host_resolver,
+    DnsRRResolver* dnsrr_resolver,
     ProxyService* proxy_service,
     ClientSocketFactory* client_socket_factory,
     SSLConfigService* ssl_config_service,
@@ -29,11 +30,13 @@ HttpNetworkSession::HttpNetworkSession(
     NetLog* net_log)
     : socket_factory_(client_socket_factory),
       host_resolver_(host_resolver),
+      dnsrr_resolver_(dnsrr_resolver),
       proxy_service_(proxy_service),
       ssl_config_service_(ssl_config_service),
       socket_pool_manager_(net_log,
                            client_socket_factory,
                            host_resolver,
+                           dnsrr_resolver,
                            proxy_service,
                            ssl_config_service),
       spdy_session_pool_(spdy_session_pool),