Cleanup: Remove unneeded browser_thread.h includes.

chrome/browser/chromeos/kiosk_mode/kiosk_mode_idle_logout_unittest.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 "chrome/browser/chromeos/kiosk_mode/kiosk_mode_idle_logout.h"
 
 #include "ash/shell.h"
 #include "ash/test/ash_test_base.h"
 #include "ash/wm/user_activity_detector.h"
 #include "base/bind.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/synchronization/waitable_event.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/chromeos/login/user_manager.h"
 #include "chrome/browser/chromeos/settings/device_settings_test_helper.h"
-#include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/notification_service.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace chromeos {
 
 class KioskModeIdleLogoutTest : public ash::test::AshTestBase {
  public:
   KioskModeIdleLogoutTest()
       : idle_logout_(NULL) {
@@ skipping 42 matching lines @@
       // checking for the current logged in user in our observer anyway, giving
       // NoDetails here is fine.
       content::NotificationService::NoDetails());
 
   RunAllPendingInMessageLoop();
   EXPECT_FALSE(LoginUserObserverRegistered());
   EXPECT_TRUE(UserActivityObserverRegistered());
 }
 
 }  // namespace chromeos