[MD settings] lighter weight initializer for protocol handler enabled messages

chrome/test/data/webui/settings/protocol_handlers_tests.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 Suite of tests for protocol_handlers. */
 cr.define('protocol_handlers', function() {
   function registerTests() {
     suite('ProtocolHandlers', function() {
       /**
        * A dummy protocol handler element created before each test.
@@ skipping 58 matching lines @@
         testElement.remove();
         testElement = null;
       });
 
       /** @return {!Promise} */
       function initPage() {
         browserProxy.reset();
         PolymerTest.clearBody();
         testElement = document.createElement('protocol-handlers');
         document.body.appendChild(testElement);
-        return browserProxy.whenCalled('initializeProtocolHandlerList').
+        return browserProxy.whenCalled('observeProtocolHandlers').
             then(Polymer.dom.flush.bind(Polymer.dom));
       }
 
       test('empty list', function() {
         return initPage().then(function(){
           var listFrames = testElement.root.querySelectorAll('.list-frame');
           assertEquals(0, listFrames.length);
         });
       });
 
@@ skipping 17 matching lines @@
           // Check that item default subtexts are rendered correctly.
           var defText = testElement.root.querySelectorAll('.protocol-default');
           assertFalse(defText[0].hidden);
           assertFalse(defText[1].hidden);
           assertTrue(defText[2].hidden);
         });
       });
 
       /**
        * A reusable function to test different action buttons.
-       * @param {!string} button id of the button to test.
-       * @param {!string} handler name of browserProxy handler to react.
+       * @param {string} button id of the button to test.
+       * @param {string} handler name of browserProxy handler to react.
        * @return {!Promise}
        */
       function testButtonFlow(button, browserProxyHandler) {
         var menuButtons, functionButton, dialog;
 
         return initPage().then(function(){
           // Initiating the elements
           menuButtons = testElement.root.
               querySelectorAll('paper-icon-button');
           functionButton = testElement.$[button];
@@ skipping 38 matching lines @@
         browserProxy.setProtocolHandlers(protocols);
         return testButtonFlow('defaultButton', 'setProtocolDefault');
       });
     });
   }
 
   return {
     registerTests: registerTests,
   };
 });