[cros] Make sure that update screen will be skipped when shortcut is pressed.

chrome/browser/chromeos/login/update_screen.h

Index: chrome/browser/chromeos/login/update_screen.h
diff --git a/chrome/browser/chromeos/login/update_screen.h b/chrome/browser/chromeos/login/update_screen.h
index 5741c5ebfec1b9e02e9e0912fc13c549fc0c1a5d..6451938a214d7493eb9cdfe1d470f8943b7a999e 100644
--- a/chrome/browser/chromeos/login/update_screen.h
+++ b/chrome/browser/chromeos/login/update_screen.h
@@ -36,7 +36,10 @@ class UpdateScreen: public DefaultViewScreen<chromeos::UpdateView>,
   virtual void CancelUpdate();
 
   // Reports update results to the ScreenObserver.
-  virtual void ExitUpdate();
+  // |forced| should be set to true when calling this method and update status
+  // is not one of UPDATE_STATUS_IDLE, UPDATE_STATUS_ERROR,
+  // UPDATE_STATUS_REPORTING_ERROR_EVENT.
+  virtual void ExitUpdate(bool forced);
 
   // Maximal curtain time get/set, in seconds.
   int maximal_curtain_time() const { return maximal_curtain_time_; }