Introduce visiblePositionOf() with PositionWithAffinity as replacement of VisiblePosition constructo

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 1346 matching lines @@
     if (!document->layoutView())
         return false;
 
     HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::Active);
     HitTestResult result(request, point);
     document->layoutView()->hitTest(result);
     Node* innerNode = result.innerNode();
     if (!innerNode || !innerNode->layoutObject())
         return false;
 
-    VisiblePosition visiblePos(innerNode->layoutObject()->positionForPoint(result.localPoint()));
+    VisiblePosition visiblePos = visiblePositionOf(innerNode->layoutObject()->positionForPoint(result.localPoint()));
     if (visiblePos.isNull())
         return false;
 
     VisiblePosition visibleStart = Strategy::selectionVisibleStart(m_selection);
     VisiblePosition visibleEnd = Strategy::selectionVisibleEnd(m_selection);
     if (visibleStart.isNull() || visibleEnd.isNull())
         return false;
 
     PositionType start(Strategy::toPositionType(visibleStart.deepEquivalent()));
     PositionType end(Strategy::toPositionType(visibleEnd.deepEquivalent()));
@@ skipping 691 matching lines @@
 
 void showTree(const blink::FrameSelection* sel)
 {
     if (sel)
         sel->showTreeForThis();
     else
         fprintf(stderr, "Cannot showTree for (nil) FrameSelection.\n");
 }
 
 #endif