Get rid of redundant parameter PositionIsOffsetInAnchor from PositionAlgorithm constructor

Source/core/editing/TypingCommand.cpp

 /*
  * Copyright (C) 2005, 2006, 2007, 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 554 matching lines @@
             // the current state of the document and we'll get the wrong result.
             Position extent = startingSelection().end();
             if (extent.containerNode() != selectionToDelete.end().containerNode())
                 extent = selectionToDelete.extent();
             else {
                 int extraCharacters;
                 if (selectionToDelete.start().containerNode() == selectionToDelete.end().containerNode())
                     extraCharacters = selectionToDelete.end().computeOffsetInContainerNode() - selectionToDelete.start().computeOffsetInContainerNode();
                 else
                     extraCharacters = selectionToDelete.end().computeOffsetInContainerNode();
-                extent = Position(extent.containerNode(), extent.computeOffsetInContainerNode() + extraCharacters, Position::PositionIsOffsetInAnchor);
+                extent = Position(extent.containerNode(), extent.computeOffsetInContainerNode() + extraCharacters);
             }
             selectionAfterUndo.setWithoutValidation(startingSelection().start(), extent);
         }
         break;
     }
     case NoSelection:
         ASSERT_NOT_REACHED();
         break;
     }
 
@@ skipping 38 matching lines @@
     ASSERT_NOT_REACHED();
     m_preservesTypingStyle = false;
 }
 
 bool TypingCommand::isTypingCommand() const
 {
     return true;
 }
 
 } // namespace blink