Fix bookmark manager regression by allowing cr.ui.Menu#findMenuItem_ to return null.

chrome/test/data/webui/webui_resource_browsertest.cc

 // Copyright 2013 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.
 
 #include <vector>
 
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "chrome/test/base/ui_test_utils.h"
@@ skipping 93 matching lines @@
   AddLibrary(IDR_WEBUI_JS_CR_UI_LIST_SINGLE_SELECTION_MODEL);
   RunTest(base::FilePath(FILE_PATH_LITERAL(
       "list_single_selection_model_test.html")));
 }
 
 IN_PROC_BROWSER_TEST_F(WebUIResourceBrowserTest, LocalStringsTest) {
   AddLibrary(IDR_WEBUI_JS_LOCAL_STRINGS);
   RunTest(base::FilePath(FILE_PATH_LITERAL("local_strings_test.html")));
 }
 
+IN_PROC_BROWSER_TEST_F(WebUIResourceBrowserTest, MenuTest) {
+  AddLibrary(IDR_WEBUI_JS_ASSERT);
+  AddLibrary(IDR_WEBUI_JS_CR);
+  AddLibrary(IDR_WEBUI_JS_CR_UI);
+  AddLibrary(IDR_WEBUI_JS_CR_UI_COMMAND);
+  AddLibrary(IDR_WEBUI_JS_CR_UI_MENU_ITEM);
+  AddLibrary(IDR_WEBUI_JS_CR_UI_MENU);
+  RunTest(base::FilePath(FILE_PATH_LITERAL("menu_test.html")));
+}
+
 IN_PROC_BROWSER_TEST_F(WebUIResourceBrowserTest, MockTimerTest) {
   RunTest(base::FilePath(FILE_PATH_LITERAL("mock_timer_test.html")));
 }
 
 IN_PROC_BROWSER_TEST_F(WebUIResourceBrowserTest, ParseHtmlSubsetTest) {
   AddLibrary(IDR_WEBUI_JS_PARSE_HTML_SUBSET);
   RunTest(base::FilePath(FILE_PATH_LITERAL("parse_html_subset_test.html")));
 }
 
 IN_PROC_BROWSER_TEST_F(WebUIResourceBrowserTest, PositionUtilTest) {
   AddLibrary(IDR_WEBUI_JS_CR);
   AddLibrary(IDR_WEBUI_JS_CR_UI_POSITION_UTIL);
   RunTest(base::FilePath(FILE_PATH_LITERAL("position_util_test.html")));
 }
 
 IN_PROC_BROWSER_TEST_F(WebUIResourceBrowserTest, RepeatingButtonTest) {
   AddLibrary(IDR_WEBUI_JS_CR);
   AddLibrary(IDR_WEBUI_JS_CR_UI);
   AddLibrary(IDR_WEBUI_JS_CR_UI_REPEATING_BUTTON);
   RunTest(base::FilePath(FILE_PATH_LITERAL("repeating_button_test.html")));
 }