Cleanup: Remove unneeded ui_test_utils.h includes.

chrome/browser/extensions/background_app_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 "chrome/browser/background/background_mode_manager.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/extension_browsertest.h"
 #include "chrome/browser/profiles/profile_manager.h"
-#include "chrome/test/base/ui_test_utils.h"
 
 class TestBackgroundModeManager : public BackgroundModeManager {
  public:
   TestBackgroundModeManager(CommandLine* command_line,
                             ProfileInfoCache* profile_cache)
       : BackgroundModeManager(command_line, profile_cache),
         showed_background_app_installed_notification_for_test_(false) {}
 
   ~TestBackgroundModeManager() override {}
 
@@ skipping 49 matching lines @@
   // Set the test flag to not shown.
   manager->set_showed_background_app_installed_notification_for_test(false);
 
   // Reload our background extension
   ReloadExtension(extension->id());
 
   // Ensure that we did not see a "Background extension loaded" dialog.
   EXPECT_FALSE(
       manager->showed_background_app_installed_notification_for_test());
 }