This is the first pass at making GetIPConfigs asynchronous.

chrome/browser/chromeos/system/ash_system_tray_delegate.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/chromeos/system/ash_system_tray_delegate.h"
 
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "ash/system/audio/audio_observer.h"
 #include "ash/system/bluetooth/bluetooth_observer.h"
@@ skipping 563 matching lines @@
                                    std::string* wifi_mac_address) OVERRIDE {
     NetworkLibrary* crosnet = CrosLibrary::Get()->GetNetworkLibrary();
     if (crosnet->Connected())
       *ip_address = crosnet->IPAddress();
     else
       *ip_address = std::string();
 
     *ethernet_mac_address = std::string();
     const NetworkDevice* ether = crosnet->FindEthernetDevice();
     if (ether)
-      crosnet->GetIPConfigs(ether->device_path(), ethernet_mac_address,
+      crosnet->GetIPConfigsAndBlock(ether->device_path(), ethernet_mac_address,
           NetworkLibrary::FORMAT_COLON_SEPARATED_HEX);
 
     *wifi_mac_address = std::string();
     const NetworkDevice* wifi = crosnet->wifi_enabled() ?
         crosnet->FindWifiDevice() : NULL;
     if (wifi)
-      crosnet->GetIPConfigs(wifi->device_path(), wifi_mac_address,
+      crosnet->GetIPConfigsAndBlock(wifi->device_path(), wifi_mac_address,
           NetworkLibrary::FORMAT_COLON_SEPARATED_HEX);
   }
 
   virtual void ConnectToNetwork(const std::string& network_id) OVERRIDE {
     NetworkLibrary* crosnet = CrosLibrary::Get()->GetNetworkLibrary();
     Network* network = crosnet->FindNetworkByPath(network_id);
     if (network)
       network_menu_->ConnectToNetwork(network);
   }
 
@@ skipping 699 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(SystemTrayDelegate);
 };
 
 }  // namespace
 
 ash::SystemTrayDelegate* CreateSystemTrayDelegate(ash::SystemTray* tray) {
   return new chromeos::SystemTrayDelegate(tray);
 }
 
 }  // namespace chromeos