net: plumb DnsRRResolver from IOThread to HttpNetworkSession.

net/socket/client_socket_pool_manager.h

Index: net/socket/client_socket_pool_manager.h
diff --git a/net/socket/client_socket_pool_manager.h b/net/socket/client_socket_pool_manager.h
index 02a73a94da207d32f37071d0a91eeec8cf9b4927..c45595609176dc80f761a26500279993215e62c4 100644
--- a/net/socket/client_socket_pool_manager.h
+++ b/net/socket/client_socket_pool_manager.h
@@ -25,6 +25,7 @@ namespace net {
 
 class ClientSocketFactory;
 class ClientSocketPoolHistograms;
+class DnsRRResolver;
 class HostPortPair;
 class HttpProxyClientSocketPool;
 class HostResolver;
@@ -58,6 +59,7 @@ class ClientSocketPoolManager : public NonThreadSafe {
   ClientSocketPoolManager(NetLog* net_log,
                           ClientSocketFactory* socket_factory,
                           HostResolver* host_resolver,
+                          DnsRRResolver* dnsrr_resolver,
                           ProxyService* proxy_service,
                           SSLConfigService* ssl_config_service);
   ~ClientSocketPoolManager();
@@ -100,6 +102,7 @@ class ClientSocketPoolManager : public NonThreadSafe {
   NetLog* const net_log_;
   ClientSocketFactory* const socket_factory_;
   HostResolver* const host_resolver_;
+  DnsRRResolver* dnsrr_resolver_;
   const scoped_refptr<ProxyService> proxy_service_;
   const scoped_refptr<SSLConfigService> ssl_config_service_;