Remove use of deprecated MessageLoop methods in chrome/.

chrome/browser/chromeos/policy/login_screen_default_policy_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 <string>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/location.h"
 #include "base/macros.h"
-#include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
+#include "base/single_thread_task_runner.h"
+#include "base/threading/thread_task_runner_handle.h"
 #include "base/values.h"
 #include "chrome/browser/chromeos/accessibility/accessibility_manager.h"
 #include "chrome/browser/chromeos/accessibility/magnification_manager.h"
 #include "chrome/browser/chromeos/policy/device_policy_builder.h"
 #include "chrome/browser/chromeos/policy/device_policy_cros_browser_test.h"
 #include "chrome/browser/chromeos/policy/proto/chrome_device_policy.pb.h"
 #include "chrome/browser/chromeos/profiles/profile_helper.h"
 #include "chrome/browser/lifetime/application_lifetime.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
@@ skipping 158 matching lines @@
       chromeos::ProfileHelper::GetSigninProfile());
 
   chromeos::MagnificationManager* magnification_manager =
       chromeos::MagnificationManager::Get();
   ASSERT_TRUE(magnification_manager);
   magnification_manager->SetProfileForTest(
       chromeos::ProfileHelper::GetSigninProfile());
 }
 
 void LoginScreenDefaultPolicyLoginScreenBrowsertest::TearDownOnMainThread() {
-  base::MessageLoop::current()->PostTask(FROM_HERE,
-                                         base::Bind(&chrome::AttemptExit));
+  base::ThreadTaskRunnerHandle::Get()->PostTask(
+      FROM_HERE, base::Bind(&chrome::AttemptExit));
   base::RunLoop().RunUntilIdle();
   LoginScreenDefaultPolicyBrowsertestBase::TearDownOnMainThread();
 }
 
 void LoginScreenDefaultPolicyLoginScreenBrowsertest::
     VerifyPrefFollowsRecommendation(const char* pref_name,
                                     const base::Value& recommended_value) {
   const PrefService::Preference* pref =
       login_profile_->GetPrefs()->FindPreference(pref_name);
   ASSERT_TRUE(pref);
@@ skipping 252 matching lines @@
                                   base::FundamentalValue(true));
 
   // Verify that the on-screen keyboard is enabled.
   chromeos::AccessibilityManager* accessibility_manager =
       chromeos::AccessibilityManager::Get();
   ASSERT_TRUE(accessibility_manager);
   EXPECT_TRUE(accessibility_manager->IsVirtualKeyboardEnabled());
 }
 
 }  // namespace policy