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

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

 /*
  * Copyright (C) 2003, 2006, 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
  * 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.
  */
 
 #include "core/layout/line/RootInlineBox.h"
 
 #include "core/dom/Document.h"
 #include "core/dom/StyleEngine.h"
+#include "core/editing/EditingUtilities.h"
 #include "core/layout/HitTestResult.h"
 #include "core/layout/VerticalPositionCache.h"
 #include "core/layout/api/LineLayoutBlockFlow.h"
 #include "core/layout/api/LineLayoutItem.h"
 #include "core/layout/line/EllipsisBox.h"
 #include "core/layout/line/GlyphOverflow.h"
 #include "core/layout/line/InlineTextBox.h"
 #include "core/paint/PaintInfo.h"
 #include "core/paint/RootInlineBoxPainter.h"
 #include "platform/text/BidiResolver.h"
@@ skipping 668 matching lines @@
     endBox = nullptr;
     return nullptr;
 }
 
 const char* RootInlineBox::boxName() const
 {
     return "RootInlineBox";
 }
 
 } // namespace blink