Convert //ash from scoped_ptr to std::unique_ptr

ash/wm/system_gesture_event_filter.h

Index: ash/wm/system_gesture_event_filter.h
diff --git a/ash/wm/system_gesture_event_filter.h b/ash/wm/system_gesture_event_filter.h
index 825b3837626c0fa284c300ebeebc39f40a904f23..57da66274e981dd1c43ef563f8f3d271cae33dfb 100644
--- a/ash/wm/system_gesture_event_filter.h
+++ b/ash/wm/system_gesture_event_filter.h
@@ -5,8 +5,9 @@
 #ifndef ASH_WM_SYSTEM_GESTURE_EVENT_FILTER_H_
 #define ASH_WM_SYSTEM_GESTURE_EVENT_FILTER_H_
 
+#include <memory>
+
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "ui/events/event_handler.h"
 
 namespace ash {
@@ -33,9 +34,9 @@ class SystemGestureEventFilter : public ui::EventHandler {
  private:
   friend class ash::test::SystemGestureEventFilterTest;
 
-  scoped_ptr<LongPressAffordanceHandler> long_press_affordance_;
-  scoped_ptr<OverviewGestureHandler> overview_gesture_handler_;
-  scoped_ptr<ShelfGestureHandler> shelf_gesture_handler_;
+  std::unique_ptr<LongPressAffordanceHandler> long_press_affordance_;
+  std::unique_ptr<OverviewGestureHandler> overview_gesture_handler_;
+  std::unique_ptr<ShelfGestureHandler> shelf_gesture_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(SystemGestureEventFilter);
 };