Fix enabled state of an input field in the browser settings.

chrome/browser/resources/options/browser_options.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() {
   const OptionsPage = options.OptionsPage;
   const ArrayDataModel = cr.ui.ArrayDataModel;
 
   //
   // BrowserOptions class
@@ skipping 384 matching lines @@
                 !this.homepage_is_newtabpage_pref_.managed));
     },
 
     /**
      * Sets the enabled state of the custom startup page list controls
      * based on the current startup radio button selection.
      * @private
      */
     updateCustomStartupPageControlStates_: function() {
       var disable = !this.shouldEnableCustomStartupPageControls();
-      $('startupPagesList').disabled = disable;
+      var startupPagesList = $('startupPagesList');
+      startupPagesList.disabled = disable;
+      // Explicitly set disabled state for input text elements.
+      var inputs = startupPagesList.querySelectorAll("input[type='text']");
+      for (var i = 0; i < inputs.length; i++)
+        inputs[i].disabled = disable;
       $('startupUseCurrentButton').disabled = disable;
     },
 
     /**
      * Handle change events of the preference
      * 'session.urls_to_restore_on_startup'.
      * @param {event} preference changed event.
      * @private
      */
     handleStartupPageListChange_: function(event) {
@@ skipping 62 matching lines @@
   BrowserOptions.updateAutocompleteSuggestions = function(suggestions) {
     BrowserOptions.getInstance().updateAutocompleteSuggestions_(suggestions);
   };
 
   // Export
   return {
     BrowserOptions: BrowserOptions
   };
 
 });