net: plumb DnsRRResolver from IOThread to HttpNetworkSession.

net/http/http_cache.cc

Index: net/http/http_cache.cc
diff --git a/net/http/http_cache.cc b/net/http/http_cache.cc
index 2b2a22126f8e651897662a478904c0c5e8f82183..a4a3f742f9b73286cba7105765f89d304102e0c0 100644
--- a/net/http/http_cache.cc
+++ b/net/http/http_cache.cc
@@ -243,7 +243,9 @@ void HttpCache::MetadataWriter::OnIOComplete(int result) {
 
 //-----------------------------------------------------------------------------
 
-HttpCache::HttpCache(HostResolver* host_resolver, ProxyService* proxy_service,
+HttpCache::HttpCache(HostResolver* host_resolver,
+                     DnsRRResolver* dnsrr_resolver,
+                     ProxyService* proxy_service,
                      SSLConfigService* ssl_config_service,
                      HttpAuthHandlerFactory* http_auth_handler_factory,
                      HttpNetworkDelegate* network_delegate,
@@ -253,8 +255,8 @@ HttpCache::HttpCache(HostResolver* host_resolver, ProxyService* proxy_service,
       building_backend_(false),
       mode_(NORMAL),
       network_layer_(HttpNetworkLayer::CreateFactory(host_resolver,
-          proxy_service, ssl_config_service, http_auth_handler_factory,
-          network_delegate, net_log)),
+          dnsrr_resolver, proxy_service, ssl_config_service,
+          http_auth_handler_factory, network_delegate, net_log)),
       ALLOW_THIS_IN_INITIALIZER_LIST(task_factory_(this)),
       enable_range_support_(true) {
 }