Revert of Converts chrome to aura-mus

chrome/browser/ui/ash/launcher/settings_window_observer.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_ASH_LAUNCHER_SETTINGS_WINDOW_OBSERVER_H_
 #define CHROME_BROWSER_UI_ASH_LAUNCHER_SETTINGS_WINDOW_OBSERVER_H_
 
-#include <memory>
-
 #include "base/macros.h"
 #include "chrome/browser/ui/settings_window_manager_observer.h"
+#include "services/ui/public/cpp/window_tracker.h"
 #include "ui/aura/window_tracker.h"
 
 // Sets the window title and shelf item properties for settings windows.
 // Settings windows are not handled by BrowserShortcutLauncherItemController.
 class SettingsWindowObserver : public chrome::SettingsWindowManagerObserver {
  public:
   SettingsWindowObserver();
   ~SettingsWindowObserver() override;
 
   // SettingsWindowManagerObserver:
   void OnNewSettingsWindow(Browser* settings_browser) override;
 
  private:
-  // Set of windows whose title is forced to 'Settings.'
+  // Window trackers that rename the Settings window in classic ash and mash.
   std::unique_ptr<aura::WindowTracker> aura_window_tracker_;
+  std::unique_ptr<ui::WindowTracker> ui_window_tracker_;
 
   DISALLOW_COPY_AND_ASSIGN(SettingsWindowObserver);
 };
 
 #endif  // CHROME_BROWSER_UI_ASH_LAUNCHER_SETTINGS_WINDOW_OBSERVER_H_