Get rid of a redundant argument DOWNSTREAM from VisbileSelection constructor call sites

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 119 matching lines @@
 #if !ENABLE(OILPAN)
 VisibleSelection::~VisibleSelection()
 {
     didChange();
 }
 #endif
 
 VisibleSelection VisibleSelection::selectionFromContentsOfNode(Node* node)
 {
     ASSERT(!editingIgnoresContent(node));
-    return VisibleSelection(firstPositionInNode(node), lastPositionInNode(node), DOWNSTREAM);
+    return VisibleSelection(firstPositionInNode(node), lastPositionInNode(node));
 }
 
 SelectionType VisibleSelection::selectionTypeInComposedTree() const
 {
     return selectionType(m_startInComposedTree, m_endInComposedTree);
 }
 
 void VisibleSelection::setBase(const Position& position)
 {
     Position oldBase = m_base;
@@ skipping 1101 matching lines @@
     sel.showTreeForThis();
 }
 
 void showTree(const blink::VisibleSelection* sel)
 {
     if (sel)
         sel->showTreeForThis();
 }
 
 #endif