MD Settings: Focus cookies search field when exiting cookie details subpage.

chrome/browser/resources/settings/site_settings_page/site_settings_page.js

 // Copyright 2015 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.
 
 /**
  * @fileoverview
  * 'settings-site-settings-page' is the settings page containing privacy and
  * security site settings.
  */
 
@@ skipping 31 matching lines @@
     },
 
     /** @private */
     enableSafeBrowsingSubresourceFilter_: {
       type: Boolean,
       value: function() {
         return loadTimeData.getBoolean('enableSafeBrowsingSubresourceFilter');
       }
     },
 
-
     /** @type {!Map<string, string>} */
     focusConfig: {
       type: Object,
       observer: 'focusConfigChanged_',
     },
   },
 
   /**
    * @param {!Map<string, string>} newConfig
    * @param {?Map<string, string>} oldConfig
@@ skipping 112 matching lines @@
   /**
    * Navigate to the route specified in the event dataset.
    * @param {!Event} event The tap event.
    * @private
    */
   onTapNavigate_: function(event) {
     var dataSet = /** @type {{route: string}} */(event.currentTarget.dataset);
     settings.navigateTo(settings.Route[dataSet.route]);
   },
 });