Revert of Converts chrome to aura-mus

chrome/browser/ui/ash/launcher/settings_window_observer.h

Index: chrome/browser/ui/ash/launcher/settings_window_observer.h
diff --git a/chrome/browser/ui/ash/launcher/settings_window_observer.h b/chrome/browser/ui/ash/launcher/settings_window_observer.h
index fcb2f04fcc6fdb7d48054bf1ec5e34b486286d98..5bbebbc717c6b544d3c6e46201a537d7dcbd5e0d 100644
--- a/chrome/browser/ui/ash/launcher/settings_window_observer.h
+++ b/chrome/browser/ui/ash/launcher/settings_window_observer.h
@@ -5,10 +5,9 @@
 #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.
@@ -22,8 +21,9 @@
   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);
 };