Move {next,previous}PositionOf() to EditingUtilities.{cpp,h} from Position.{cpp,h}

Source/core/layout/PendingSelection.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 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 "config.h"
 #include "core/layout/PendingSelection.h"
 
 #include "core/dom/Document.h"
+#include "core/editing/EditingUtilities.h"
 #include "core/editing/FrameSelection.h"
 #include "core/editing/VisiblePosition.h"
 #include "core/editing/VisibleUnits.h"
 #include "core/html/HTMLTextFormControlElement.h"
 
 namespace blink {
 
 PendingSelection::PendingSelection()
     : m_hasPendingSelection(false)
     , m_shouldShowBlockCursor(false)
@@ skipping 75 matching lines @@
         return calcVisibleSelectionAlgorithm<VisibleSelection::InComposedTree>();
     return calcVisibleSelectionAlgorithm<VisibleSelection::InDOMTree>();
 }
 
 DEFINE_TRACE(PendingSelection)
 {
     visitor->trace(m_selection);
 }
 
 } // namespace blink