net: plumb DnsRRResolver from IOThread to HttpNetworkSession.

net/proxy/proxy_script_fetcher_unittest.cc

Index: net/proxy/proxy_script_fetcher_unittest.cc
diff --git a/net/proxy/proxy_script_fetcher_unittest.cc b/net/proxy/proxy_script_fetcher_unittest.cc
index 64754a4fe517a16ba3d42b243b62681cbcb3893d..ce54a9baeb3fd16733731952ac59c6d29a33c0b6 100644
--- a/net/proxy/proxy_script_fetcher_unittest.cc
+++ b/net/proxy/proxy_script_fetcher_unittest.cc
@@ -41,8 +41,8 @@ class RequestContext : public URLRequestContext {
     ssl_config_service_ = new net::SSLConfigServiceDefaults;
 
     http_transaction_factory_ = new net::HttpCache(
-        net::HttpNetworkLayer::CreateFactory(host_resolver_, proxy_service_,
-            ssl_config_service_, NULL, NULL, NULL),
+        net::HttpNetworkLayer::CreateFactory(host_resolver_, NULL,
+            proxy_service_, ssl_config_service_, NULL, NULL, NULL),
         net::HttpCache::DefaultBackend::InMemory(0));
   }