Introduce lineDirectionPointForBlockDirectionNavigationOf() for VisiblePosition

Source/core/editing/FrameSelection.cpp

 /*
  * Copyright (C) 2004, 2008, 2009, 2010 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 1193 matching lines @@
     }
 
     LocalFrame* frame = pos.document()->frame();
     if (!frame)
         return x;
 
     if (m_xPosForVerticalArrowNavigation == NoXPosForVerticalArrowNavigation()) {
         VisiblePosition visiblePosition(pos, m_selection.affinity());
         // VisiblePosition creation can fail here if a node containing the selection becomes visibility:hidden
         // after the selection is created and before this function is called.
-        x = visiblePosition.lineDirectionPointForBlockDirectionNavigation();
+        x = lineDirectionPointForBlockDirectionNavigationOf(visiblePosition);
         m_xPosForVerticalArrowNavigation = x;
     } else {
         x = m_xPosForVerticalArrowNavigation;
     }
 
     return x;
 }
 
 void FrameSelection::clear()
 {
@@ skipping 844 matching lines @@
 
 void showTree(const blink::FrameSelection* sel)
 {
     if (sel)
         sel->showTreeForThis();
     else
         fprintf(stderr, "Cannot showTree for (nil) FrameSelection.\n");
 }
 
 #endif