Site Settings Desktop: Add Closure coverage for Protocol Handlers.

chrome/browser/resources/settings/site_settings/site_settings_prefs_browser_proxy.js

 // Copyright 2016 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 A helper object used from the "Site Settings" section to
  * interact with the content settings prefs.
  */
 
 /**
@@ skipping 22 matching lines @@
  *            exceptions: ExceptionListPref}}
  */
 var SiteSettingsPref;
 
 /**
  * @typedef {{name: string,
  *            id: string}}
  */
 var MediaPickerEntry;
 
+/**
+ * @typedef {{protocol: string,
+ *            spec: string}}
+ */
+ var ProtocolHandlerEntry;
+
 cr.define('settings', function() {
   /** @interface */
   function SiteSettingsPrefsBrowserProxy() {}
 
   SiteSettingsPrefsBrowserProxy.prototype = {
     /**
      * Sets the default value for a site settings category.
      * @param {string} contentType The name of the category to change.
      * @param {string} defaultValue The name of the value to set as default.
      */
@@ skipping 191 matching lines @@
     removeProtocolHandler: function(protocol, url) {
       chrome.send('removeHandler', [[protocol, url]]);
     },
   };
 
   return {
     SiteSettingsPrefsBrowserProxy: SiteSettingsPrefsBrowserProxy,
     SiteSettingsPrefsBrowserProxyImpl: SiteSettingsPrefsBrowserProxyImpl,
   };
 });