Expand the footer in the material design Clear Browsing Data dialog.

chrome/test/data/webui/settings/privacy_page_test.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.
 
 cr.define('settings_privacy_page', function() {
   /**
    * @constructor
    * @extends {TestBrowserProxy}
    * @implements {settings.PrivacyPageBrowserProxy}
    */
   function TestPrivacyPageBrowserProxy() {
     settings.TestBrowserProxy.call(this, ['showManageSSLCertificates']);
   }
 
   TestPrivacyPageBrowserProxy.prototype = {
     __proto__: settings.TestBrowserProxy.prototype,
 
     /** @override */
     showManageSSLCertificates: function() {
       this.methodCalled('showManageSSLCertificates');
     },
   };
 
   /**
    * @constructor
    * @extends {TestBrowserProxy}
    * @implements {settings.ClearBrowsingDataBrowserProxy}
    */
   function TestClearBrowsingDataBrowserProxy() {
-    settings.TestBrowserProxy.call(this, ['clearBrowsingData']);
+    settings.TestBrowserProxy.call(this, [
+      'initialize',
+      'clearBrowsingData',
+    ]);
 
     /**
      * The promise to return from |clearBrowsingData|.
      * Allows testing code to test what happens after the call is made, and
      * before the browser responds.
      * @private {?Promise}
      */
     this.clearBrowsingDataPromise_ = null;
   }
 
   TestClearBrowsingDataBrowserProxy.prototype = {
     __proto__: settings.TestBrowserProxy.prototype,
 
     /** @param {!Promise} promise */
     setClearBrowsingDataPromise: function(promise) {
       this.clearBrowsingDataPromise_ = promise;
     },
 
     /** @override */
     clearBrowsingData: function() {
       this.methodCalled('clearBrowsingData');
       return this.clearBrowsingDataPromise_ !== null ?
           this.clearBrowsingDataPromise_ : Promise.resolve();
     },
+
+    /** @override */
+    initialize: function() {
+      this.methodCalled('initialize');
+    },
   };
 
   function registerNativeCertificateManagerTests() {
     suite('NativeCertificateManager', function() {
       /** @type {settings.TestPrivacyPageBrowserProxy} */
       var testBrowserProxy;
 
       /** @type {SettingsPrivacyPageElement} */
       var page;
 
@@ skipping 75 matching lines @@
 
   return {
     registerTests: function() {
       if (cr.isMac || cr.isWin)
         registerNativeCertificateManagerTests();
 
       registerClearBrowsingDataTests();
     },
   };
 });