Start removing deprecated Options UI code

chrome/browser/ui/webui/options/chromeos/guest_mode_options_browsertest.h

-// Copyright 2016 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_OPTIONS_CHROMEOS_GUEST_MODE_OPTIONS_BROWSERTEST_H_
-#define CHROME_BROWSER_UI_WEBUI_OPTIONS_CHROMEOS_GUEST_MODE_OPTIONS_BROWSERTEST_H_
-
-#include "base/command_line.h"
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-#include "chrome/test/base/web_ui_browser_test.h"
-#include "content/public/browser/web_ui_message_handler.h"
-
-// This is a helper class used by guest_mode_options_browsertest.js to enable
-// guest mode.
-class GuestModeOptionsUIBrowserTest : public WebUIBrowserTest {
- public:
-  GuestModeOptionsUIBrowserTest();
-  ~GuestModeOptionsUIBrowserTest() override;
-
- private:
-  void SetUpCommandLine(base::CommandLine* command_line) override;
-
-  DISALLOW_COPY_AND_ASSIGN(GuestModeOptionsUIBrowserTest);
-};
-
-#endif  // CHROME_BROWSER_UI_WEBUI_OPTIONS_CHROMEOS_GUEST_MODE_OPTIONS_BROWSERTEST_H_