blink: Cleanup core class forward declarations

third_party/WebKit/Source/core/html/HTMLElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004-2007, 2009, 2014 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 14 matching lines @@
 
 #include "core/CoreExport.h"
 #include "core/dom/Element.h"
 
 namespace blink {
 
 class DocumentFragment;
 class HTMLFormElement;
 class HTMLMenuElement;
 class ExceptionState;
+class KeyboardEvent;
 
 enum TranslateAttributeMode {
   TranslateAttributeYes,
   TranslateAttributeNo,
   TranslateAttributeInherit
 };
 
 class CORE_EXPORT HTMLElement : public Element {
   DEFINE_WRAPPERTYPEINFO();
 
@@ skipping 185 matching lines @@
   inline bool isElementOfType<const thisType>(const HTMLElement& element) {  \
     return is##thisType(element);                                            \
   }                                                                          \
   DEFINE_ELEMENT_TYPE_CASTS_WITH_FUNCTION(thisType)
 
 }  // namespace blink
 
 #include "core/HTMLElementTypeHelpers.h"
 
 #endif  // HTMLElement_h