Move computeInlineBoxPosition() out from VisiblePosition

Source/core/editing/VisibleUnits.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 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 955 matching lines @@
     if (!node)
         return VisiblePosition();
 
     node->document().updateLayoutIgnorePendingStylesheets();
 
     LayoutObject* layoutObject = node->layoutObject();
     if (!layoutObject)
         return VisiblePosition();
 
     RootInlineBox* root = 0;
-    InlineBox* box = visiblePosition.computeInlineBoxPosition().inlineBox;
+    InlineBox* box = computeInlineBoxPosition(visiblePosition).inlineBox;
     if (box) {
         root = box->root().prevRootBox();
         // We want to skip zero height boxes.
         // This could happen in case it is a TrailingFloatsRootInlineBox.
         if (!root || !root->logicalHeight() || !root->firstLeafChild())
             root = 0;
     }
 
     if (!root) {
         Position position = previousRootInlineBoxCandidatePosition(node, visiblePosition, editableType);
@@ skipping 32 matching lines @@
     if (!node)
         return VisiblePosition();
 
     node->document().updateLayoutIgnorePendingStylesheets();
 
     LayoutObject* layoutObject = node->layoutObject();
     if (!layoutObject)
         return VisiblePosition();
 
     RootInlineBox* root = 0;
-    InlineBox* box = visiblePosition.computeInlineBoxPosition().inlineBox;
+    InlineBox* box = computeInlineBoxPosition(visiblePosition).inlineBox;
     if (box) {
         root = box->root().nextRootBox();
         // We want to skip zero height boxes.
         // This could happen in case it is a TrailingFloatsRootInlineBox.
         if (!root || !root->logicalHeight() || !root->firstLeafChild())
             root = 0;
     }
 
     if (!root) {
         // FIXME: We need do the same in previousLinePosition.
@@ skipping 555 matching lines @@
 
     if (previousRenderedEditable(position1.anchorNode()) == position2.anchorNode()
         && !renderedOffset1 && renderedOffset2 == caretMaxOffset(position2.anchorNode())) {
         return false;
     }
 
     return true;
 }
 
 }