blink: Cleanup core class forward declarations

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

 /*
  * Copyright (C) 2006, 2007, 2009 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 14 matching lines @@
 #include "core/dom/Document.h"
 #include "core/frame/FrameOwner.h"
 #include "core/html/HTMLElement.h"
 #include "platform/heap/Handle.h"
 #include "platform/scroll/ScrollTypes.h"
 #include "platform/weborigin/SecurityPolicy.h"
 #include "wtf/HashCountedSet.h"
 
 namespace blink {
 
-class LocalDOMWindow;
 class ExceptionState;
 class Frame;
 class LayoutPart;
 class Widget;
 
 class CORE_EXPORT HTMLFrameOwnerElement : public HTMLElement,
                                           public FrameOwner {
   USING_GARBAGE_COLLECTED_MIXIN(HTMLFrameOwnerElement);
 
  public:
@@ skipping 110 matching lines @@
 
 DEFINE_TYPE_CASTS(HTMLFrameOwnerElement,
                   FrameOwner,
                   owner,
                   owner->isLocal(),
                   owner.isLocal());
 
 }  // namespace blink
 
 #endif  // HTMLFrameOwnerElement_h