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

ui/events/gestures/gesture_recognizer_impl_mac.cc

Index: ui/events/gestures/gesture_recognizer_impl_mac.cc
diff --git a/ui/events/gestures/gesture_recognizer_impl_mac.cc b/ui/events/gestures/gesture_recognizer_impl_mac.cc
index 4dfa311803c25a5eaff1ea73c9f8787416b531e4..90c18f6416d58117d281120331d26f7a69bc8d76 100644
--- a/ui/events/gestures/gesture_recognizer_impl_mac.cc
+++ b/ui/events/gestures/gesture_recognizer_impl_mac.cc
@@ -30,7 +30,6 @@ class GestureRecognizerImplMac : public GestureRecognizer {
     return NULL;
   }
   virtual Gestures* ProcessTouchEventOnAsyncAck(
-      const TouchEvent& event,
       ui::EventResult result,
       GestureConsumer* consumer) OVERRIDE {
     return NULL;