Introduce visiblePositionOf() with PositionWithAffinity as replacement of VisiblePosition constructo

Source/core/editing/VisibleSelection.cpp

 /*
  * Copyright (C) 2004, 2005, 2006 Apple Computer, 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 1008 matching lines @@
 {
     if (m_startInComposedTree.isNull())
         return;
     if (m_startInComposedTree.compareTo(m_endInComposedTree) <= 0)
         return;
     std::swap(m_startInComposedTree, m_endInComposedTree);
 }
 
 VisiblePosition VisibleSelection::visiblePositionRespectingEditingBoundary(const LayoutPoint& localPoint, Node* targetNode) const
 {
-    return VisiblePosition(positionRespectingEditingBoundary(localPoint, targetNode));
+    return visiblePositionOf(positionRespectingEditingBoundary(localPoint, targetNode));
 }
 
 PositionWithAffinity VisibleSelection::positionRespectingEditingBoundary(const LayoutPoint& localPoint, Node* targetNode) const
 {
     if (!targetNode->layoutObject())
         return PositionWithAffinity();
 
     LayoutPoint selectionEndPoint = localPoint;
     Element* editableElement = rootEditableElement();
 
@@ skipping 207 matching lines @@
     sel.showTreeForThis();
 }
 
 void showTree(const blink::VisibleSelection* sel)
 {
     if (sel)
         sel->showTreeForThis();
 }
 
 #endif