MD WebUI: Make cr-lazy-render get() synchronous

chrome/test/data/webui/md_history/history_grouped_list_test.js

Index: chrome/test/data/webui/md_history/history_grouped_list_test.js
diff --git a/chrome/test/data/webui/md_history/history_grouped_list_test.js b/chrome/test/data/webui/md_history/history_grouped_list_test.js
index 95e1471dcd3322d814a13723f4d0a6b0a2440191..8eb7b9285137bc8fbf4c22213127b97b9fb88e4a 100644
--- a/chrome/test/data/webui/md_history/history_grouped_list_test.js
+++ b/chrome/test/data/webui/md_history/history_grouped_list_test.js
@@ -240,8 +240,8 @@ cr.define('md_history.history_grouped_list_test', function() {
           return flush();
         }).then(function() {
           MockInteractions.tap(app.$.toolbar.$$('#delete-button'));
-          return listContainer.$.dialog.get();
-        }).then(function(dialog) {
+          var dialog = listContainer.$.dialog.get();
+
           registerMessageCallback('removeVisits', this, function() {
             flush().then(function() {
               deleteComplete();