Replace scoped_ptr with std::unique_ptr in //ui

ui/display/win/screen_win.h

Index: ui/display/win/screen_win.h
diff --git a/ui/display/win/screen_win.h b/ui/display/win/screen_win.h
index da18ed1c7aed9318cf221948ef5e60b519898c9f..f1c56308e9a481c000269a1336a2a20bc32f5b71 100644
--- a/ui/display/win/screen_win.h
+++ b/ui/display/win/screen_win.h
@@ -7,10 +7,10 @@
 
 #include <windows.h>
 
+#include <memory>
 #include <vector>
 
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "ui/display/display_export.h"
 #include "ui/gfx/display_change_notifier.h"
 #include "ui/gfx/native_widget_types.h"
@@ -88,7 +88,7 @@ class DISPLAY_EXPORT ScreenWin : public gfx::Screen {
   // Helper implementing the DisplayObserver handling.
   gfx::DisplayChangeNotifier change_notifier_;
 
-  scoped_ptr<gfx::SingletonHwndObserver> singleton_hwnd_observer_;
+  std::unique_ptr<gfx::SingletonHwndObserver> singleton_hwnd_observer_;
 
   // Current list of ScreenWinDisplays.
   std::vector<ScreenWinDisplay> screen_win_displays_;