Fix TypeError when closing overlay

chrome/browser/resources/options/options_page.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 cr.define('options', function() {
   /** @const */ var FocusOutlineManager = cr.ui.FocusOutlineManager;
 
   /////////////////////////////////////////////////////////////////////////////
   // OptionsPage class:
 
@@ skipping 337 matching lines @@
     }
   };
 
   /**
    * Cancels (closes) the overlay, due to the user pressing <Esc>.
    */
   OptionsPage.cancelOverlay = function() {
     // Blur the active element to ensure any changed pref value is saved.
     document.activeElement.blur();
     var overlay = this.getVisibleOverlay_();
+    if (!overlay)
+      return;
     // Let the overlay handle the <Esc> if it wants to.
     if (overlay.handleCancel) {
       overlay.handleCancel();
       this.restoreLastFocusedElement_();
     } else {
       this.closeOverlay();
     }
   };
 
   /**
@@ skipping 647 matching lines @@
     canShowPage: function() {
       return true;
     },
   };
 
   // Export
   return {
     OptionsPage: OptionsPage
   };
 });