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

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

 /*
  * Copyright (C) 2005 Apple Computer
  *
  * 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 LayoutButton_h
 #define LayoutButton_h
 
+#include "core/editing/EditingUtilities.h"
 #include "core/html/HTMLInputElement.h"
 #include "core/layout/LayoutFlexibleBox.h"
 
 namespace blink {
 
 // LayoutButtons are just like normal flexboxes except that they will generate an anonymous block child.
 // For inputs, they will also generate an anonymous LayoutText and keep its style and content up
 // to date as the button changes.
 class LayoutButton final : public LayoutFlexibleBox {
 public:
@@ skipping 21 matching lines @@
     bool hasLineIfEmpty() const override { return isHTMLInputElement(node()); }
 
     LayoutBlock* m_inner;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutButton, isLayoutButton());
 
 } // namespace blink
 
 #endif // LayoutButton_h