Refactor kiosk app launch to be part of login screen UI flow.

chrome/browser/ui/webui/chromeos/app_launch_ui.h

-// Copyright (c) 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.
-
-#ifndef CHROME_BROWSER_UI_WEBUI_CHROMEOS_APP_LAUNCH_UI_H_
-#define CHROME_BROWSER_UI_WEBUI_CHROMEOS_APP_LAUNCH_UI_H_
-
-#include <string>
-
-#include "content/public/browser/web_ui_controller.h"
-
-namespace chromeos {
-
-// A custom WebUI that shows app install/launch splash screen in ChromeOS
-// app mode (aka Kiosk).
-class AppLaunchUI : public content::WebUIController {
- public:
-  explicit AppLaunchUI(content::WebUI* web_ui);
-
-  void SetLaunchText(const std::string& text);
-
- private:
-  class AppLaunchUIHandler;
-
-  AppLaunchUIHandler* handler_;  // Owned by WebUI.
-
-  DISALLOW_COPY_AND_ASSIGN(AppLaunchUI);
-};
-
-}  // namespace chromeos
-
-#endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_APP_LAUNCH_UI_H_