mac: Flush the autorelease pool after making a browser window in browser tests.

chrome/browser/ui/webui/webui_webview_browsertest.cc

 // Copyright 2015 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 "base/macros.h"
 #include "base/path_service.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/url_constants.h"
@@ skipping 120 matching lines @@
 
   ASSERT_TRUE(WebUIBrowserTest::RunJavascriptAsyncTest(
       "testAddContentScriptWithCode",
       new base::StringValue(GetTestUrl("empty.html").spec())));
 }
 
 #if defined(OS_CHROMEOS)
 // Right now we only have incognito WebUI on CrOS, but this should
 // theoretically work for all platforms.
 IN_PROC_BROWSER_TEST_F(WebUIWebViewBrowserTest, AddContentScriptIncognito) {
-  Browser* incognito_browser = ui_test_utils::OpenURLOffTheRecord(
-      browser()->profile(), GetWebViewEnabledWebUIURL());
+  Browser* incognito_browser =
+      OpenURLOffTheRecord(browser()->profile(), GetWebViewEnabledWebUIURL());
 
   SetWebUIInstance(
       incognito_browser->tab_strip_model()->GetActiveWebContents()->GetWebUI());
 
   ASSERT_TRUE(WebUIBrowserTest::RunJavascriptAsyncTest(
       "testAddContentScript",
       new base::StringValue(GetTestUrl("empty.html").spec())));
 }
 #endif