blink: Cleanup core class forward declarations

third_party/WebKit/Source/core/frame/FrameView.h

 /*
    Copyright (C) 1997 Martin Jones (mjones@kde.org)
              (C) 1998 Waldo Bastian (bastian@kde.org)
              (C) 1998, 1999 Torben Weis (weis@kde.org)
              (C) 1999 Lars Knoll (knoll@kde.org)
              (C) 1999 Antti Koivisto (koivisto@kde.org)
    Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights
    reserved.
 
    This library is free software; you can redistribute it and/or
@@ skipping 46 matching lines @@
 
 namespace blink {
 
 class AXObjectCache;
 class CancellableTaskFactory;
 class ComputedStyle;
 class DocumentLifecycle;
 class Cursor;
 class Element;
 class FloatSize;
-class HTMLFrameOwnerElement;
 class JSONArray;
 class JSONObject;
 class LayoutItem;
 class LayoutViewItem;
 class LayoutPart;
 class LocalFrame;
 class KURL;
 class Node;
 class LayoutAnalyzer;
 class LayoutBox;
@@ skipping 1057 matching lines @@
                   widget.isFrameView());
 DEFINE_TYPE_CASTS(FrameView,
                   ScrollableArea,
                   scrollableArea,
                   scrollableArea->isFrameView(),
                   scrollableArea.isFrameView());
 
 }  // namespace blink
 
 #endif  // FrameView_h