blink: Cleanup class/struct forward declarations

third_party/WebKit/Source/core/layout/line/RootInlineBox.h

 /*
  * Copyright (C) 2003, 2006, 2007, 2008 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 17 matching lines @@
 #include "wtf/PtrUtil.h"
 #include <memory>
 
 namespace blink {
 
 class EllipsisBox;
 class HitTestResult;
 class LineLayoutBlockFlow;
 
 struct BidiStatus;
-struct GapRects;
 
 class RootInlineBox : public InlineFlowBox {
  public:
   explicit RootInlineBox(LineLayoutItem);
 
   void destroy() final;
 
   bool isRootInlineBox() const final { return true; }
 
   void detachEllipsisBox();
@@ skipping 182 matching lines @@
   LayoutUnit m_lineBottom;
   LayoutUnit m_lineTopWithLeading;
   LayoutUnit m_lineBottomWithLeading;
   LayoutUnit m_selectionBottom;
   LayoutUnit m_paginationStrut;
 };
 
 }  // namespace blink
 
 #endif  // RootInlineBox_h