Don't use base::MessageLoop::{Quit,QuitClosure} in chrome/

chrome/browser/ui/browser_browsertest.cc

 // Copyright 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 <string>
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/files/file_path.h"
@@ skipping 1025 matching lines @@
   void TearDownOnMainThread() override {
     // Cycle both the MessageLoop and the Cocoa runloop twice to flush out any
     // Chrome work that generates Cocoa work. Do this twice since there are two
     // Browsers that must be closed.
     CycleRunLoops();
     CycleRunLoops();
 
     // Run the application event loop to completion, which will cycle the
     // native MessagePump on all platforms.
     base::MessageLoop::current()->task_runner()->PostTask(
-        FROM_HERE, base::MessageLoop::QuitClosure());
+        FROM_HERE, base::MessageLoop::QuitWhenIdleClosure());
     base::MessageLoop::current()->Run();
 
     // Take care of any remaining Cocoa work.
     CycleRunLoops();
 
     // At this point, quit should be for real now.
     ASSERT_EQ(0u, chrome::GetTotalBrowserCount());
   }
 
   // A helper function that cycles the MessageLoop, and on Mac, the Cocoa run
@@ skipping 2128 matching lines @@
 
   // Sync navigation just to make sure IPC has passed (updated
   // display mode is delivered to RP).
   content::TestNavigationObserver observer(app_contents, 1);
   ui_test_utils::NavigateToURL(app_browser, GURL(url::kAboutBlankURL));
   observer.Wait();
 
   CheckDisplayModeMQ(ASCIIToUTF16("fullscreen"), app_contents);
 }