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

ui/events/gestures/gesture_recognizer_impl_mac.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/macros.h"
 #include "ui/events/gestures/gesture_recognizer.h"
 
 namespace ui {
 
 namespace {
@@ skipping 12 matching lines @@
     return false;
   }
 
   virtual Gestures* ProcessTouchEventPostDispatch(
       const TouchEvent& event,
       ui::EventResult result,
       GestureConsumer* consumer) OVERRIDE {
     return NULL;
   }
   virtual Gestures* ProcessTouchEventOnAsyncAck(
-      const TouchEvent& event,
       ui::EventResult result,
       GestureConsumer* consumer) OVERRIDE {
     return NULL;
   };
   virtual bool CleanupStateForConsumer(GestureConsumer* consumer) OVERRIDE {
     return false;
   }
   virtual GestureConsumer* GetTouchLockedTarget(
       const TouchEvent& event) OVERRIDE {
     return NULL;
@@ skipping 23 matching lines @@
 
 }  // namespace
 
 // static
 GestureRecognizer* GestureRecognizer::Get() {
   CR_DEFINE_STATIC_LOCAL(GestureRecognizerImplMac, instance, ());
   return &instance;
 }
 
 }  // namespace ui