ui: Remove TouchStatus in favour of EventResult.

ash/wm/system_gesture_event_filter.cc

Index: ash/wm/system_gesture_event_filter.cc
diff --git a/ash/wm/system_gesture_event_filter.cc b/ash/wm/system_gesture_event_filter.cc
index bf8279bce90b3aecf4e83305ec28c1c60b7a66b8..7b28385b66311292e22166c9da45f238852b55e7 100644
--- a/ash/wm/system_gesture_event_filter.cc
+++ b/ash/wm/system_gesture_event_filter.cc
@@ -72,12 +72,12 @@ bool SystemGestureEventFilter::PreHandleMouseEvent(aura::Window* target,
   return false;
 }
 
-ui::TouchStatus SystemGestureEventFilter::PreHandleTouchEvent(
+ui::EventResult SystemGestureEventFilter::PreHandleTouchEvent(
     aura::Window* target,
     ui::TouchEvent* event) {
   touch_uma_.RecordTouchEvent(target, *event);
   long_press_affordance_->ProcessEvent(target, event, event->touch_id());
-  return ui::TOUCH_STATUS_UNKNOWN;
+  return ui::ER_UNHANDLED;
 }
 
 ui::EventResult SystemGestureEventFilter::PreHandleGestureEvent(