[Editing] Modify mostForward/BackwardCaretPosition naming confusion.

Source/core/editing/Position.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 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 465 matching lines @@
     if (isNull())
         return true;
     // TODO(yosin) We should use |Strategy::lastOffsetForEditing()| instead of
     // DOM tree version.
     return !Strategy::parent(*anchorNode()) && m_offset >= EditingStrategy::lastOffsetForEditing(anchorNode());
 }
 
 template <typename Strategy>
 PositionAlgorithm<Strategy> PositionAlgorithm<Strategy>::upstream(EditingBoundaryCrossingRule rule) const
 {
-    return mostForwardCaretPosition(*this, rule);
+    return mostBackwardCaretPosition(*this, rule);
 }
 
 template <typename Strategy>
 PositionAlgorithm<Strategy> PositionAlgorithm<Strategy>::downstream(EditingBoundaryCrossingRule rule) const
 {
-    return mostBackwardCaretPosition(*this, rule);
+    return mostForwardCaretPosition(*this, rule);
 }
 
 // TODO(yosin) We should move |isVisuallyEquivalentCandidate()| to
 // "VisibleUnits.cpp" to reduce |LayoutObject| dependency in "Position.cpp".
 template <typename Strategy>
 static bool isVisuallyEquivalentCandidateAlgorithm(const PositionAlgorithm<Strategy>& position)
 {
     Node* const anchorNode = position.anchorNode();
     if (!anchorNode)
         return false;
@@ skipping 522 matching lines @@
 
 void showTree(const blink::Position* pos)
 {
     if (pos)
         pos->showTreeForThis();
     else
         fprintf(stderr, "Cannot showTree for (nil)\n");
 }
 
 #endif