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

chrome/browser/chromeos/login/lock/screen_locker_tester.cc

 // Copyright 2014 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 "chrome/browser/chromeos/login/lock/screen_locker_tester.h"
 
 #include <string>
 
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
@@ skipping 64 matching lines @@
     waiting_ = true;
     content::RunMessageLoop();
     waiting_ = false;
   }
   ASSERT_TRUE(login_attempted_);
 }
 
 void LoginAttemptObserver::LoginAttempted() {
   login_attempted_ = true;
   if (waiting_)
-    base::MessageLoopForUI::current()->Quit();
+    base::MessageLoopForUI::current()->QuitWhenIdle();
 }
 
 }  // anyonymous namespace
 
 namespace chromeos {
 
 namespace test {
 
 class WebUIScreenLockerTester : public ScreenLockerTester {
  public:
@@ skipping 113 matching lines @@
       new FakeExtendedAuthenticator(ScreenLocker::screen_locker_, user_context);
 }
 
 }  // namespace test
 
 test::ScreenLockerTester* ScreenLocker::GetTester() {
   return new test::WebUIScreenLockerTester();
 }
 
 }  // namespace chromeos