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

Source/modules/accessibility/AXLayoutObject.cpp

 /*
 * Copyright (C) 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
@@ skipping 2027 matching lines @@
 
     if (!anchorNode || !focusNode)
         return;
 
     LocalFrame* frame = layoutObject()->frame();
     if (!frame)
         return;
 
     frame->selection().setSelection(VisibleSelection(
         Position(anchorNode, selection.anchorOffset),
-        Position(focusNode, selection.focusOffset),
-        DOWNSTREAM));
+        Position(focusNode, selection.focusOffset)));
 }
 
 bool AXLayoutObject::isValidSelectionBound(const AXObject* boundObject) const
 {
     return boundObject && !boundObject->isDetached()
         && boundObject->isAXLayoutObject()
         && boundObject->layoutObject()->frame() == layoutObject()->frame()
         && &boundObject->axObjectCache() == &axObjectCache();
 }
 
@@ skipping 585 matching lines @@
         if (label && label->layoutObject()) {
             LayoutRect labelRect = axObjectCache().getOrCreate(label)->elementRect();
             result.unite(labelRect);
         }
     }
 
     return result;
 }
 
 } // namespace blink