Get rid of a redundant function alias lastPositionInNode()

third_party/WebKit/Source/core/editing/commands/InsertTextCommand.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 265 matching lines @@
             // insert the span before it.
             if (offset > 0)
                 splitTextNode(textNode, offset);
             insertNodeBefore(spanElement, textNode, editingState);
         }
     }
     if (editingState->isAborted())
         return Position();
 
     // return the position following the new tab
-    return lastPositionInNode(spanElement);
+    return Position::lastPositionInNode(spanElement);
 }
 
 } // namespace blink