Added processing for a lost status to UpdateEngineClient.

chrome/browser/ui/webui/help/version_updater_chromeos.cc

Index: chrome/browser/ui/webui/help/version_updater_chromeos.cc
diff --git a/chrome/browser/ui/webui/help/version_updater_chromeos.cc b/chrome/browser/ui/webui/help/version_updater_chromeos.cc
index 371b901e4b3096eca48115ba18dbef8daf317f94..e6c2f2afe8fa893afd418ce55719ccaf8c843c4f 100644
--- a/chrome/browser/ui/webui/help/version_updater_chromeos.cc
+++ b/chrome/browser/ui/webui/help/version_updater_chromeos.cc
@@ -175,6 +175,7 @@ void VersionUpdaterCros::UpdateStatusChanged(
   switch (operation_to_show) {
     case UpdateEngineClient::UPDATE_STATUS_ERROR:
     case UpdateEngineClient::UPDATE_STATUS_REPORTING_ERROR_EVENT:
+    case UpdateEngineClient::UPDATE_STATUS_ATTEMPTING_ROLLBACK:
       // This path previously used the FAILED status and IDS_UPGRADE_ERROR, but
       // the update engine reports errors for some conditions that shouldn't
       // actually be displayed as errors to users: http://crbug.com/146919.