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

ui/events/gestures/gesture_recognizer.h

 // Copyright (c) 2012 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.
 
 #ifndef UI_EVENTS_GESTURES_GESTURE_RECOGNIZER_H_
 #define UI_EVENTS_GESTURES_GESTURE_RECOGNIZER_H_
 
 #include <vector>
 
 #include "base/memory/scoped_vector.h"
@@ skipping 22 matching lines @@
                                             GestureConsumer* consumer) = 0;
   // Returns a list of zero or more GestureEvents. The caller is responsible for
   // freeing the returned events. Called synchronously after event dispatch.
   virtual Gestures* ProcessTouchEventPostDispatch(
       const TouchEvent& event,
       ui::EventResult result,
       GestureConsumer* consumer) = 0;
   // Returns a list of zero or more GestureEvents. The caller is responsible for
   // freeing the returned events. Called when a touch event receives an
   // asynchronous ack.
-  virtual Gestures* ProcessTouchEventOnAsyncAck(const TouchEvent& event,
-                                                ui::EventResult result,
+  virtual Gestures* ProcessTouchEventOnAsyncAck(ui::EventResult result,
                                                 GestureConsumer* consumer) = 0;
 
   // This is called when the consumer is destroyed. So this should cleanup any
   // internal state maintained for |consumer|. Returns true iff there was
   // state relating to |consumer| to clean up.
   virtual bool CleanupStateForConsumer(GestureConsumer* consumer) = 0;
 
   // Return the window which should handle this TouchEvent, in the case where
   // the touch is already associated with a target.
   // Otherwise, returns null.
@@ skipping 38 matching lines @@
 
   // Unsubscribes |helper| from async gesture dispatch.
   // Since the GestureRecognizer does not own the |helper|, it is not deleted
   // and must be cleaned up appropriately by the caller.
   virtual void RemoveGestureEventHelper(GestureEventHelper* helper) = 0;
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_GESTURES_GESTURE_RECOGNIZER_H_