Avoid doing concurrent DNS resolves of the same hostname

chrome/browser/net/dns_master_unittest.cc

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <time.h>
 
 #include <algorithm>
 #include <sstream>
 #include <string>
 
@@ skipping 95 matching lines @@
 }
 
 //------------------------------------------------------------------------------
 // Use a blocking function to contrast results we get via async services.
 //------------------------------------------------------------------------------
 TimeDelta BlockingDnsLookup(const std::string& hostname) {
     Time start = Time::Now();
 
     net::HostResolver resolver;
     net::AddressList addresses;
-    resolver.Resolve(hostname, 80, &addresses, NULL);
+    resolver.Resolve(hostname, 80, &addresses, NULL, NULL);
 
     return Time::Now() - start;
 }
 
 //------------------------------------------------------------------------------
 
 // First test to be sure the OS is caching lookups, which is the whole premise
 // of DNS prefetching.
 TEST_F(DnsMasterTest, OsCachesLookupsTest) {
   mapper_->AllowDirectLookup("*.google.com");
@@ skipping 481 matching lines @@
   EXPECT_EQ(queue.Pop(), "startup");
   EXPECT_EQ(queue.Pop(), "omni");
 
   EXPECT_TRUE(queue.IsEmpty());
 }
 
 
 
 
 }  // namespace chrome_browser_net