[Editing][DOM][CodeHealth] Move Node::*editable* functions to core/editing

third_party/WebKit/Source/core/layout/LayoutTextFragment.h

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007 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
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #ifndef LayoutTextFragment_h
 #define LayoutTextFragment_h
 
+#include "core/editing/EditingUtilities.h"
 #include "core/layout/LayoutText.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class FirstLetterPseudoElement;
 
 // Used to represent a text substring of an element, e.g., for text runs that are split because of
 // first letter and that must therefore have different styles (and positions in the layout tree).
 // We cache offsets so that text transformations can be applied in such a way that we can recover
@@ skipping 54 matching lines @@
     // Reference back to FirstLetterPseudoElement; cleared by FirstLetterPseudoElement::detachLayoutTree() if
     // it goes away first.
     UntracedMember<FirstLetterPseudoElement> m_firstLetterPseudoElement;
 };
 
 DEFINE_TYPE_CASTS(LayoutTextFragment, LayoutObject, object, toLayoutText(object)->isTextFragment(), toLayoutText(object).isTextFragment());
 
 } // namespace blink
 
 #endif // LayoutTextFragment_h