Ensure proper finalization of garbage-collected types.

Source/core/events/TouchEventContext.cpp

 /*
  * Copyright (C) 2014 Google Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 27 matching lines @@
     return adoptRefWillBeNoop(new TouchEventContext);
 }
 
 TouchEventContext::TouchEventContext()
     : m_touches(TouchList::create())
     , m_targetTouches(TouchList::create())
     , m_changedTouches(TouchList::create())
 {
 }
 
-TouchEventContext::~TouchEventContext()
-{
-}
+DEFINE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(TouchEventContext)
 
 void TouchEventContext::handleLocalEvents(Event* event) const
 {
     ASSERT(event->isTouchEvent());
     TouchEvent* touchEvent = toTouchEvent(event);
     touchEvent->setTouches(m_touches);
     touchEvent->setTargetTouches(m_targetTouches);
     touchEvent->setChangedTouches(m_changedTouches);
 }
 
 void TouchEventContext::trace(Visitor* visitor)
 {
     visitor->trace(m_touches);
     visitor->trace(m_targetTouches);
     visitor->trace(m_changedTouches);
 }
 
 }