Have NodeTraversal::nextSkippingChildren() take a reference

Source/core/editing/VisibleUnits.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 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 1211 matching lines @@
                     if ((*text)[i] == '\n')
                         return VisiblePosition(Position(toText(n), i), DOWNSTREAM);
                 }
             }
             node = n;
             offset = r->caretMaxOffset();
             n = NodeTraversal::next(*n, stayInsideBlock);
         } else if (editingIgnoresContent(n) || isRenderedTable(n)) {
             node = n;
             type = Position::PositionIsAfterAnchor;
-            n = NodeTraversal::nextSkippingChildren(n, stayInsideBlock);
+            n = NodeTraversal::nextSkippingChildren(*n, stayInsideBlock);
         } else {
             n = NodeTraversal::next(*n, stayInsideBlock);
         }
     }
 
     if (type == Position::PositionIsOffsetInAnchor)
         return VisiblePosition(Position(node, offset, type), DOWNSTREAM);
 
     return VisiblePosition(Position(node, type), DOWNSTREAM);
 }
@@ skipping 166 matching lines @@
 {
     return direction == LTR ? logicalStartOfLine(c) : logicalEndOfLine(c);
 }
 
 VisiblePosition rightBoundaryOfLine(const VisiblePosition& c, TextDirection direction)
 {
     return direction == LTR ? logicalEndOfLine(c) : logicalStartOfLine(c);
 }
 
 }