mash: Remove ash::ShelfGestureHandler and ui::ET_GESTURE_WIN8_EDGE_SWIPE

ui/wm/core/compound_event_filter.cc

Index: ui/wm/core/compound_event_filter.cc
diff --git a/ui/wm/core/compound_event_filter.cc b/ui/wm/core/compound_event_filter.cc
index 74ecae27ae4d9b6c6dcc883afc557e8c54d88820..8942dfdfeb091afa3e561c57aad2ca03d4f451c6 100644
--- a/ui/wm/core/compound_event_filter.cc
+++ b/ui/wm/core/compound_event_filter.cc
@@ -245,17 +245,6 @@ void CompoundEventFilter::OnGestureEvent(ui::GestureEvent* event) {
     while (!event->stopped_propagation() && (handler = it.GetNext()) != NULL)
       handler->OnGestureEvent(event);
   }
-
-#if defined(OS_WIN)
-  // A Win8 edge swipe event is a special event that does not have location
-  // information associated with it, and is not preceeded by an ET_TOUCH_PRESSED
-  // event.  So we treat it specially here.
-  if (!event->handled() && event->type() == ui::ET_GESTURE_WIN8_EDGE_SWIPE &&
-      !aura::Env::GetInstance()->IsMouseButtonDown()) {
-    SetMouseEventsEnableStateOnEvent(
-        static_cast<aura::Window*>(event->target()), event, false);
-  }
-#endif
 }
 
 }  // namespace wm