[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
===================================================================
--- chrome/browser/chromeos/login/update_screen.h	(revision 67705)
+++ chrome/browser/chromeos/login/update_screen.h	(working copy)
@@ -36,7 +36,10 @@
   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_; }