Improve performance of proxy resolver by tracing DNS dependencies.

chrome/browser/net/connection_tester.cc

 // Copyright (c) 2012 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 "chrome/browser/net/connection_tester.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/logging.h"
@@ skipping 188 matching lines @@
     }
 
 #if defined(OS_IOS)
     experiment_proxy_service->reset(
         net::ProxyService::CreateUsingSystemProxyResolver(
             proxy_config_service->release(), 0u, NULL));
 #else
     experiment_proxy_service->reset(
         net::CreateProxyServiceUsingV8ProxyResolver(
             proxy_config_service->release(),
-            0u,
             new net::ProxyScriptFetcherImpl(proxy_request_context_),
             dhcp_factory.Create(proxy_request_context_),
             host_resolver(),
             NULL,
             NULL));
 #endif
 
     return net::OK;
   }
 
@@ skipping 318 matching lines @@
 
   // Notify the delegate of completion.
   delegate_->OnCompletedConnectionTestExperiment(current, result);
 
   if (remaining_experiments_.empty()) {
     delegate_->OnCompletedConnectionTestSuite();
   } else {
     StartNextExperiment();
   }
 }