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

ui/events/gestures/gesture_recognizer.h

Index: ui/events/gestures/gesture_recognizer.h
diff --git a/ui/events/gestures/gesture_recognizer.h b/ui/events/gestures/gesture_recognizer.h
index 9ed07049f1477ff112a799f23e3b97acd8efdf48..325efa21c7838e372139c3301382ee0df11780f1 100644
--- a/ui/events/gestures/gesture_recognizer.h
+++ b/ui/events/gestures/gesture_recognizer.h
@@ -34,10 +34,8 @@ class EVENTS_EXPORT GestureRecognizer {
 
   // Returns a list of zero or more GestureEvents. The caller is responsible for
   // freeing the returned events. Acks the first gesture packet in the queue.
-  virtual Gestures* AckAsyncTouchEvent(
-      const TouchEvent& event,
-      ui::EventResult result,
-      GestureConsumer* consumer) = 0;
+  virtual Gestures* AckAsyncTouchEvent(ui::EventResult result,
+                                       GestureConsumer* consumer) = 0;
 
   // Returns a list of zero or more GestureEvents. The caller is responsible for
   // freeing the returned events. Acks the last gesture packet in the queue.