This is the first pass at making GetIPConfigs asynchronous.

chrome/browser/chromeos/system/ash_system_tray_delegate.cc

Index: chrome/browser/chromeos/system/ash_system_tray_delegate.cc
diff --git a/chrome/browser/chromeos/system/ash_system_tray_delegate.cc b/chrome/browser/chromeos/system/ash_system_tray_delegate.cc
index cc6930c476388b6433ed6e60b8f5c07715a6e881..0a48ff3a76733091fc917ebd74984ecc84a96e10 100644
--- a/chrome/browser/chromeos/system/ash_system_tray_delegate.cc
+++ b/chrome/browser/chromeos/system/ash_system_tray_delegate.cc
@@ -581,14 +581,14 @@ class SystemTrayDelegate : public ash::SystemTrayDelegate,
     *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);
   }