Don't pass touches to gesture recognizer for async acks.

ui/aura/window_event_dispatcher.h

Index: ui/aura/window_event_dispatcher.h
diff --git a/ui/aura/window_event_dispatcher.h b/ui/aura/window_event_dispatcher.h
index 1c2c6f11cfb21381110f0081e45d878fff00ef94..f7df77c3a158af9868020b813fa0f789f905b7e5 100644
--- a/ui/aura/window_event_dispatcher.h
+++ b/ui/aura/window_event_dispatcher.h
@@ -89,9 +89,7 @@ class AURA_EXPORT WindowEventDispatcher : public ui::EventProcessor,
   // window should let the WindowEventDispatcher know about the result of the
   // event processing, so that gesture events can be properly created and
   // dispatched.
-  void ProcessedTouchEvent(ui::TouchEvent* event,
-                           Window* window,
-                           ui::EventResult result);
+  virtual void ProcessedTouchEvent(Window* window, ui::EventResult result);
 
   // These methods are used to defer the processing of mouse/touch events
   // related to resize. A client (typically a RenderWidgetHostViewAura) can call