Clear DNS cache when launching Add User - use correct API now.

chrome/browser/ui/webui/chromeos/login/signin_screen_handler.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/ui/webui/chromeos/login/signin_screen_handler.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/command_line.h"
@@ skipping 71 matching lines @@
 const char kReasonNetworkChanged[] = "network changed";
 const char kReasonProxyChanged[] = "proxy changed";
 const char kReasonPortalDetected[] = "portal detected";
 
 // The Task posted to PostTaskAndReply in StartClearingDnsCache on the IO
 // thread.
 void ClearDnsCache(IOThread* io_thread) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   if (browser_shutdown::IsTryingToQuit())
     return;
+
+  io_thread->ClearHostCache();
 }
 
 }  // namespace
 
 namespace chromeos {
 
 namespace {
 
 // Updates params dictionary passed to the auth extension with related
 // preferences from CrosSettings.
@@ skipping 1002 matching lines @@
       !dns_clear_task_running_ &&
       network_state_informer_->is_online()) {
     gaia_silent_load_ = true;
     gaia_silent_load_network_ =
         network_state_informer_->active_network_service_path();
     LoadAuthExtension(true, true, false);
   }
 }
 
 }  // namespace chromeos