Clean up forward declarations in Source/core/events

Source/core/events/EventTarget.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  *           (C) 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ skipping 26 matching lines @@
 #include "core/events/ThreadLocalEventNames.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class LocalDOMWindow;
 class Event;
 class ExceptionState;
 class MessagePort;
 class Node;
-class TextTrack;
-class TextTrackCue;
-class XMLHttpRequest;
-class XMLHttpRequestUpload;
 
 struct FiringEventIterator {
     FiringEventIterator(const AtomicString& eventType, size_t& iterator, size_t& end)
         : eventType(eventType)
         , iterator(iterator)
         , end(end)
     {
     }
 
     const AtomicString& eventType;
@@ skipping 202 matching lines @@
     typedef int thisIsHereToForceASemiColonAfterThisEventTargetMacro
 #define DEFINE_EVENT_TARGET_REFCOUNTING_WILL_BE_REMOVED(baseClass) DEFINE_EVENT_TARGET_REFCOUNTING(baseClass)
 #endif
 
 // Use this macro if your EventTarget subclass is also a subclass of WTF::RefCounted.
 // A ref-counted class that uses a different method of refcounting should use DEFINE_EVENT_TARGET_REFCOUNTING directly.
 // Both of these macros are meant to be placed just before the "public:" section of the class declaration.
 #define REFCOUNTED_EVENT_TARGET(className) DEFINE_EVENT_TARGET_REFCOUNTING_WILL_BE_REMOVED(RefCounted<className>)
 
 #endif // EventTarget_h