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

Source/core/editing/iterators/TextIterator.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2005 Alexey Proskuryakov.
  *
  * 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 858 matching lines @@
     // Additionally, if the range we are iterating over contains huge sections of unrendered content,
     // we would create VisiblePositions on every call to this function without this check.
     if (!m_node->layoutObject() || m_node->layoutObject()->style()->visibility() != VISIBLE
         || (m_node->layoutObject()->isLayoutBlockFlow() && !toLayoutBlock(m_node->layoutObject())->size().height() && !isHTMLBodyElement(*m_node)))
         return false;
 
     // The startPos.isNotNull() check is needed because the start could be before the body,
     // and in that case we'll get null. We don't want to put in newlines at the start in that case.
     // The currPos.isNotNull() check is needed because positions in non-HTML content
     // (like SVG) do not have visible positions, and we don't want to emit for them either.
-    VisiblePosition startPos = VisiblePosition(Position(m_startContainer, m_startOffset), DOWNSTREAM);
-    VisiblePosition currPos = VisiblePosition(positionBeforeNode(m_node), DOWNSTREAM);
+    VisiblePosition startPos = VisiblePosition(Position(m_startContainer, m_startOffset));
+    VisiblePosition currPos = VisiblePosition(positionBeforeNode(m_node));
     return startPos.isNotNull() && currPos.isNotNull() && !inSameLine(startPos, currPos);
 }
 
 template<typename Strategy>
 bool TextIteratorAlgorithm<Strategy>::shouldEmitSpaceBeforeAndAfterNode(Node* node)
 {
     return isRenderedTableElement(node) && (node->layoutObject()->isInline() || emitsCharactersBetweenAllVisiblePositions());
 }
 
 template<typename Strategy>
@@ skipping 222 matching lines @@
 
 String plainText(const EphemeralRangeInComposedTree& range, TextIteratorBehaviorFlags behavior)
 {
     return createPlainText<EditingInComposedTreeStrategy>(range, behavior);
 }
 
 template class CORE_TEMPLATE_EXPORT TextIteratorAlgorithm<EditingStrategy>;
 template class CORE_TEMPLATE_EXPORT TextIteratorAlgorithm<EditingInComposedTreeStrategy>;
 
 } // namespace blink