Move computeInlineBoxPosition out from PositionAlgorithm class

Source/core/editing/RenderedPosition.cpp

 /*
  * Copyright (C) 2011 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 74 matching lines @@
 
 RenderedPosition::RenderedPosition(const Position& position, TextAffinity affinity)
     : m_layoutObject(nullptr)
     , m_inlineBox(nullptr)
     , m_offset(0)
     , m_prevLeafChild(uncachedInlineBox())
     , m_nextLeafChild(uncachedInlineBox())
 {
     if (position.isNull())
         return;
-    InlineBoxPosition boxPosition = position.computeInlineBoxPosition(affinity);
+    InlineBoxPosition boxPosition = computeInlineBoxPosition(position, affinity);
     m_inlineBox = boxPosition.inlineBox;
     m_offset = boxPosition.offsetInBox;
     if (m_inlineBox)
         m_layoutObject = &m_inlineBox->layoutObject();
     else
         m_layoutObject = layoutObjectFromPosition(position);
 }
 
 RenderedPosition::RenderedPosition(const PositionInComposedTree& position, TextAffinity affinity)
     : RenderedPosition(toPositionInDOMTree(position), affinity)
@@ skipping 154 matching lines @@
 bool layoutObjectContainsPosition(LayoutObject* target, const Position& position)
 {
     for (LayoutObject* layoutObject = layoutObjectFromPosition(position); layoutObject && layoutObject->node(); layoutObject = layoutObject->parent()) {
         if (layoutObject == target)
             return true;
     }
     return false;
 }
 
 };