Clean up forward declarations in Source/core/events

Source/core/events/FocusEvent.h

 /*
  * Copyright (C) 2013 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 13 matching lines @@
  */
 
 #ifndef FocusEvent_h
 #define FocusEvent_h
 
 #include "core/events/EventTarget.h"
 #include "core/events/UIEvent.h"
 
 namespace blink {
 
-class Node;
-
 struct FocusEventInit : public UIEventInit {
     FocusEventInit();
 
     RefPtrWillBeMember<EventTarget> relatedTarget;
 };
 
 class FocusEvent final : public UIEvent {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static PassRefPtrWillBeRawPtr<FocusEvent> create()
@@ skipping 61 matching lines @@
     static PassRefPtrWillBeRawPtr<FocusOutEventDispatchMediator> create(PassRefPtrWillBeRawPtr<FocusEvent>);
 private:
     explicit FocusOutEventDispatchMediator(PassRefPtrWillBeRawPtr<FocusEvent>);
     FocusEvent* event() const { return static_cast<FocusEvent*>(EventDispatchMediator::event()); }
     virtual bool dispatchEvent(EventDispatcher*) const override;
 };
 
 } // namespace blink
 
 #endif // FocusEvent_h