Avoid doing concurrent DNS resolves of the same hostname

net/proxy/proxy_script_fetcher_unittest.cc

Index: net/proxy/proxy_script_fetcher_unittest.cc
===================================================================
--- net/proxy/proxy_script_fetcher_unittest.cc	(revision 18213)
+++ net/proxy/proxy_script_fetcher_unittest.cc	(working copy)
@@ -30,15 +30,18 @@
  public:
   RequestContext() {
     net::ProxyConfig no_proxy;
+    host_resolver_ = new net::HostResolver;
     proxy_service_ = net::ProxyService::CreateFixed(no_proxy);
 
     http_transaction_factory_ =
-        new net::HttpCache(net::HttpNetworkLayer::CreateFactory(proxy_service_),
-                           disk_cache::CreateInMemoryCacheBackend(0));
+        new net::HttpCache(net::HttpNetworkLayer::CreateFactory(
+            host_resolver_, proxy_service_),
+            disk_cache::CreateInMemoryCacheBackend(0));
   }
   ~RequestContext() {
     delete http_transaction_factory_;
     delete proxy_service_;
+    delete host_resolver_;
   }
 };