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

chrome/service/net/service_url_request_context.cc

Index: chrome/service/net/service_url_request_context.cc
diff --git a/chrome/service/net/service_url_request_context.cc b/chrome/service/net/service_url_request_context.cc
index 1050e29d6fdc572975645593b2fee310c7178f16..7238d7f2155af21550d336451dd5e577ab047d4c 100644
--- a/chrome/service/net/service_url_request_context.cc
+++ b/chrome/service/net/service_url_request_context.cc
@@ -110,9 +110,7 @@ ServiceURLRequestContext::ServiceURLRequestContext(
     : user_agent_(user_agent),
       ALLOW_THIS_IN_INITIALIZER_LIST(storage_(this)) {
   storage_.set_host_resolver(
-      net::CreateSystemHostResolver(net::HostResolver::kDefaultParallelism,
-                                    net::HostResolver::kDefaultRetryAttempts,
-                                    NULL));
+      net::HostResolver::CreateDefaultResolver(NULL).release());
   storage_.set_proxy_service(net::ProxyService::CreateUsingSystemProxyResolver(
       net_proxy_config_service, 0u, NULL));
   storage_.set_cert_verifier(net::CertVerifier::CreateDefault());