[MD settings] advanced toggle; add scrollWhenReady

chrome/test/data/webui/settings/settings_page_browsertest.js

Index: chrome/test/data/webui/settings/settings_page_browsertest.js
diff --git a/chrome/test/data/webui/settings/settings_page_browsertest.js b/chrome/test/data/webui/settings/settings_page_browsertest.js
index 676411e6e83ab1adbd4ed27c9fb99393cab45406..f7de861327fabcd1919cfa663e8a4ab3845305b9 100644
--- a/chrome/test/data/webui/settings/settings_page_browsertest.js
+++ b/chrome/test/data/webui/settings/settings_page_browsertest.js
@@ -51,10 +51,8 @@ SettingsPageBrowserTest.prototype = {
     assertTrue(!!settingsUi);
     var settingsMain = settingsUi.$$('settings-main');
     assertTrue(!!settingsMain);
-    var pages = settingsMain.$.pageContainer;
-    assertTrue(!!pages);
     var pageType = 'settings-' + type + '-page';
-    var page = pages.querySelector(pageType);
+    var page = settingsMain.$$(pageType);
     assertTrue(!!page);
     return page;
   },