Introduce PositionAlgorithm<Strategy>::editingPositionOf()

Source/core/editing/commands/DeleteSelectionCommand.cpp

 /*
  * Copyright (C) 2005 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 542 matching lines @@
                 } else if (!(startNodeWasDescendantOfEndNode && !m_upstreamStart.inDocument())) {
                     int offset = 0;
                     if (m_upstreamStart.anchorNode()->isDescendantOf(m_downstreamEnd.anchorNode())) {
                         Node* n = m_upstreamStart.anchorNode();
                         while (n && n->parentNode() != m_downstreamEnd.anchorNode())
                             n = n->parentNode();
                         if (n)
                             offset = n->nodeIndex() + 1;
                     }
                     removeChildrenInRange(m_downstreamEnd.anchorNode(), offset, m_downstreamEnd.computeEditingOffset());
-                    m_downstreamEnd = createLegacyEditingPosition(m_downstreamEnd.anchorNode(), offset);
+                    m_downstreamEnd = Position::editingPositionOf(m_downstreamEnd.anchorNode(), offset);
                 }
             }
         }
     }
 }
 
 void DeleteSelectionCommand::fixupWhitespace()
 {
     document().updateLayoutIgnorePendingStylesheets();
     // FIXME: isRenderedCharacter should be removed, and we should use VisiblePosition::characterAfter and VisiblePosition::characterBefore
@@ skipping 323 matching lines @@
     visitor->trace(m_deleteIntoBlockquoteStyle);
     visitor->trace(m_startRoot);
     visitor->trace(m_endRoot);
     visitor->trace(m_startTableRow);
     visitor->trace(m_endTableRow);
     visitor->trace(m_temporaryPlaceholder);
     CompositeEditCommand::trace(visitor);
 }
 
 } // namespace blink