[net] Change factory methods for HostResolver and HostCache to return a scoped_ptr

remoting/host/url_request_context.cc

Index: remoting/host/url_request_context.cc
diff --git a/remoting/host/url_request_context.cc b/remoting/host/url_request_context.cc
index 9d47f260ca1d49ed401e0af3747c1e7e527a426c..86a29e46316e71d50280abf99900feacf7db6ea8 100644
--- a/remoting/host/url_request_context.cc
+++ b/remoting/host/url_request_context.cc
@@ -84,9 +84,7 @@ URLRequestContext::URLRequestContext(
     : ALLOW_THIS_IN_INITIALIZER_LIST(storage_(this)) {
   scoped_ptr<VlogNetLog> net_log(new VlogNetLog());
   storage_.set_host_resolver(
-      net::CreateSystemHostResolver(net::HostResolver::kDefaultParallelism,
-                                    net::HostResolver::kDefaultRetryAttempts,
-                                    net_log.get()));
+      net::HostResolver::CreateDefaultResolver(net_log.get()));
   storage_.set_proxy_service(net::ProxyService::CreateUsingSystemProxyResolver(
       proxy_config_service.release(), 0u, net_log.get()));
   storage_.set_cert_verifier(net::CertVerifier::CreateDefault());