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

chrome/browser/prerender/prerender_browsertest.cc

 // Copyright (c) 2012 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 <deque>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
@@ skipping 3911 matching lines @@
 IN_PROC_BROWSER_TEST_F(PrerenderBrowserTest, PrerenderWindowClose) {
   DisableLoadEventCheck();
   PrerenderTestURL("files/prerender/prerender_window_close.html",
                    FINAL_STATUS_CLOSED, 0);
 }
 
 class PrerenderIncognitoBrowserTest : public PrerenderBrowserTest {
  public:
   void SetUpOnMainThread() override {
     Profile* normal_profile = current_browser()->profile();
-    set_browser(ui_test_utils::OpenURLOffTheRecord(
-        normal_profile, GURL("about:blank")));
+    set_browser(OpenURLOffTheRecord(normal_profile, GURL("about:blank")));
     PrerenderBrowserTest::SetUpOnMainThread();
   }
 };
 
 // Checks that prerendering works in incognito mode.
 IN_PROC_BROWSER_TEST_F(PrerenderIncognitoBrowserTest, PrerenderIncognito) {
   PrerenderTestURL("files/prerender/prerender_page.html", FINAL_STATUS_USED, 1);
   NavigateToDestURL();
 }
 
@@ skipping 195 matching lines @@
 
   NavigateToDestURL();
   EXPECT_EQ(1U, task_manager.tasks().size());
 }
 
 }  // namespace
 
 #endif  // defined(ENABLE_TASK_MANAGER)
 
 }  // namespace prerender