web-ui settings: Fix setting enabled state of commit button.

chrome/browser/resources/options/import_data_overlay.js

 // Copyright (c) 2011 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() {
   var OptionsPage = options.OptionsPage;
 
   /**
    * ImportDataOverlay class
    * Encapsulated handling of the 'Import Data' overlay page.
@@ skipping 148 matching lines @@
     if (state) {
       var checkboxes =
           document.querySelectorAll('#import-checkboxes input[type=checkbox]');
       for (var i = 0; i < checkboxes.length; i++) {
         checkboxes[i].disabled = true;
       }
     } else {
       ImportDataOverlay.getInstance().updateCheckboxes_();
     }
     $('import-browsers').disabled = state;
-    $('import-data-commit').disabled = state;
     $('import-throbber').style.visibility = state ? "visible" : "hidden";
+    ImportDataOverlay.getInstance().validateCommitButton_();
   };
 
   /**
    * Remove the import overlay from display.
    */
   ImportDataOverlay.dismiss = function() {
     ImportDataOverlay.setImportingState(false);
     OptionsPage.closeOverlay();
   };
 
   // Export
   return {
     ImportDataOverlay: ImportDataOverlay
   };
 });