[net/dns] Refactoring of job dispatch in HostResolverImpl in preparation for DnsTransactionFactory.

chrome/browser/net/connection_tester.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/importer/firefox_proxy_settings.h"
 #include "chrome/common/chrome_switches.h"
 #include "net/base/cert_verifier.h"
 #include "net/base/cookie_monster.h"
 #include "net/base/host_resolver.h"
-#include "net/base/host_resolver_impl.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
 #include "net/base/net_util.h"
 #include "net/base/ssl_config_service_defaults.h"
 #include "net/ftp/ftp_network_layer.h"
 #include "net/http/http_auth_handler_factory.h"
 #include "net/http/http_cache.h"
 #include "net/http/http_network_session.h"
 #include "net/http/http_server_properties_impl.h"
 #include "net/proxy/dhcp_proxy_script_fetcher_factory.h"
@@ skipping 72 matching lines @@
  private:
   // Creates a host resolver for |experiment|. On success returns net::OK and
   // fills |host_resolver| with a new pointer. Otherwise returns a network
   // error code.
   int CreateHostResolver(
       ConnectionTester::HostResolverExperiment experiment,
       scoped_ptr<net::HostResolver>* host_resolver) {
     // Create a vanilla HostResolver that disables caching.
     const size_t kMaxJobs = 50u;
     const size_t kMaxRetryAttempts = 4u;
-    net::HostResolverImpl* impl =
-        new net::HostResolverImpl(NULL, NULL, kMaxJobs, kMaxRetryAttempts,
-                                  NULL);
+    net::HostResolver* impl = net::CreateNonCachingSystemHostResolver(
+        kMaxJobs,
+        kMaxRetryAttempts,
+        NULL /* NetLog */);
 
     host_resolver->reset(impl);
 
     // Modify it slightly based on the experiment being run.
     switch (experiment) {
       case ConnectionTester::HOST_RESOLVER_EXPERIMENT_PLAIN:
         return net::OK;
       case ConnectionTester::HOST_RESOLVER_EXPERIMENT_DISABLE_IPV6:
         impl->SetDefaultAddressFamily(net::ADDRESS_FAMILY_IPV4);
         return net::OK;
@@ skipping 335 matching lines @@
 
   // Notify the delegate of completion.
   delegate_->OnCompletedConnectionTestExperiment(current, result);
 
   if (remaining_experiments_.empty()) {
     delegate_->OnCompletedConnectionTestSuite();
   } else {
     StartNextExperiment();
   }
 }