Convert first letter into a pseudo element.

Source/core/rendering/RenderBoxModelObject.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2006, 2007, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google 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 163 matching lines @@
     bool calculateHasBoxDecorations() const;
 
     RenderBoxModelObject* continuation() const;
     void setContinuation(RenderBoxModelObject*);
 
     LayoutRect localCaretRectForEmptyElement(LayoutUnit width, LayoutUnit textIndentOffset);
 
     bool hasAutoHeightOrContainingBlockWithAutoHeight() const;
 
 public:
-
-    // For RenderBlocks and RenderInlines with m_style->styleType() == FIRST_LETTER, this tracks their remaining text fragments
-    RenderTextFragment* firstLetterRemainingText() const;
-    void setFirstLetterRemainingText(RenderTextFragment*);
-
     // These functions are only used internally to manipulate the render tree structure via remove/insert/appendChildNode.
     // Since they are typically called only to move objects around within anonymous blocks (which only have layers in
     // the case of column spans), the default for fullRemoveInsert is false rather than true.
     void moveChildTo(RenderBoxModelObject* toBoxModelObject, RenderObject* child, RenderObject* beforeChild, bool fullRemoveInsert = false);
     void moveChildTo(RenderBoxModelObject* toBoxModelObject, RenderObject* child, bool fullRemoveInsert = false)
     {
         moveChildTo(toBoxModelObject, child, 0, fullRemoveInsert);
     }
     void moveAllChildrenTo(RenderBoxModelObject* toBoxModelObject, bool fullRemoveInsert = false)
     {
@@ skipping 17 matching lines @@
 private:
     LayoutUnit computedCSSPadding(const Length&) const;
     virtual bool isBoxModelObject() const override final { return true; }
 };
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderBoxModelObject, isBoxModelObject());
 
 } // namespace blink
 
 #endif // RenderBoxModelObject_h