Add a command line option to turn off retry attempts to resolve host

net/proxy/proxy_script_fetcher_impl_unittest.cc

 // Copyright (c) 2011 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 "net/proxy/proxy_script_fetcher_impl.h"
 
 #include <string>
 
 #include "base/file_path.h"
 #include "base/compiler_specific.h"
@@ skipping 27 matching lines @@
   string16 text;
 };
 
 // A non-mock URL request which can access http:// and file:// urls.
 class RequestContext : public URLRequestContext {
  public:
   RequestContext() : ALLOW_THIS_IN_INITIALIZER_LIST(storage_(this)) {
     ProxyConfig no_proxy;
     storage_.set_host_resolver(
         CreateSystemHostResolver(HostResolver::kDefaultParallelism,
+                                 HostResolver::kDefaultRetryAttempts,
                                  NULL));
     storage_.set_cert_verifier(new CertVerifier);
     storage_.set_proxy_service(ProxyService::CreateFixed(no_proxy));
     storage_.set_ssl_config_service(new SSLConfigServiceDefaults);
 
     HttpNetworkSession::Params params;
     params.host_resolver = host_resolver();
     params.cert_verifier = cert_verifier();
     params.proxy_service = proxy_service();
     params.ssl_config_service = ssl_config_service();
@@ skipping 315 matching lines @@
   {
     GURL url(kEncodedUrlBroken);
     string16 text;
     TestCompletionCallback callback;
     int result = pac_fetcher.Fetch(url, &text, &callback);
     EXPECT_EQ(ERR_FAILED, result);
   }
 }
 
 }  // namespace net