Introduce visiblePositionOf() with PositionWithAffinity as replacement of VisiblePosition constructo

Source/core/editing/DragCaretController.cpp

Index: Source/core/editing/DragCaretController.cpp
diff --git a/Source/core/editing/DragCaretController.cpp b/Source/core/editing/DragCaretController.cpp
index df2a49fbd4d1a2d98bc4ac7369fed4bb28dbc64f..34d6c2823b565c7aad04883bd084aee5113bc03d 100644
--- a/Source/core/editing/DragCaretController.cpp
+++ b/Source/core/editing/DragCaretController.cpp
@@ -56,7 +56,7 @@ void DragCaretController::setCaretPosition(const PositionWithAffinity& position)
 
     if (Node* node = m_position.deepEquivalent().anchorNode())
         invalidateCaretRect(node);
-    m_position = VisiblePosition(position);
+    m_position = visiblePositionOf(position);
     Document* document = nullptr;
     if (Node* node = m_position.deepEquivalent().anchorNode()) {
         invalidateCaretRect(node);