Modify UpdateLibrary to use async RequestUpdateCheck call

chrome/browser/ui/webui/options/about_page_handler.cc

Index: chrome/browser/ui/webui/options/about_page_handler.cc
diff --git a/chrome/browser/ui/webui/options/about_page_handler.cc b/chrome/browser/ui/webui/options/about_page_handler.cc
index 9f6f1a4bda9395523dfbaa94545698962550cd2d..c6c8fca46b6afee333ee8b7cc594b8391bf76a6b 100644
--- a/chrome/browser/ui/webui/options/about_page_handler.cc
+++ b/chrome/browser/ui/webui/options/about_page_handler.cc
@@ -315,7 +315,9 @@ void AboutPageHandler::CheckNow(const ListValue* args) {
   if (chromeos::CrosLibrary::Get()->EnsureLoaded() &&
       (!WizardController::default_controller() ||
         WizardController::IsDeviceRegistered())) {
-    chromeos::CrosLibrary::Get()->GetUpdateLibrary()->CheckForUpdate();
+    chromeos::CrosLibrary::Get()->GetUpdateLibrary()->
+        RequestUpdateCheck(NULL,   // no callback
+                           NULL);  // no userdata
   }
 }