Introduce PositionAlgorithm<Strategy>::editingPositionOf()

Source/core/dom/RangeBoundaryPoint.h

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 91 matching lines @@
     if (m_offsetInContainer >= 0)
         return;
 
     ASSERT(m_childBeforeBoundary);
     m_offsetInContainer = m_childBeforeBoundary->nodeIndex() + 1;
 }
 
 inline const Position RangeBoundaryPoint::toPosition() const
 {
     ensureOffsetIsValid();
-    return createLegacyEditingPosition(m_containerNode.get(), m_offsetInContainer);
+    return Position::editingPositionOf(m_containerNode.get(), m_offsetInContainer);
 }
 
 inline int RangeBoundaryPoint::offset() const
 {
     ensureOffsetIsValid();
     return m_offsetInContainer;
 }
 
 inline void RangeBoundaryPoint::clear()
 {
@@ skipping 73 matching lines @@
     } else {
         if (a.offset() != b.offset())
             return false;
     }
     return true;
 }
 
 }
 
 #endif