Avoid doing concurrent DNS resolves of the same hostname

net/proxy/proxy_resolver_perftest.cc

Index: net/proxy/proxy_resolver_perftest.cc
===================================================================
--- net/proxy/proxy_resolver_perftest.cc	(revision 18213)
+++ net/proxy/proxy_resolver_perftest.cc	(working copy)
@@ -185,7 +185,12 @@
 #endif
 
 TEST(ProxyResolverPerfTest, ProxyResolverV8) {
-  net::ProxyResolverV8 resolver;
+  net::HostResolver host_resolver;
+
+  net::ProxyResolverV8::JSBindings* js_bindings =
+      net::ProxyResolverV8::CreateDefaultBindings(&host_resolver, NULL);
+
+  net::ProxyResolverV8 resolver(js_bindings);
   PacPerfSuiteRunner runner(&resolver, "ProxyResolverV8");
   runner.RunAllTests();
 }