Introduce visiblePositionOf() with PositionWithAffinity as replacement of VisiblePosition constructo

Source/core/editing/VisiblePosition.h

Index: Source/core/editing/VisiblePosition.h
diff --git a/Source/core/editing/VisiblePosition.h b/Source/core/editing/VisiblePosition.h
index 7d6f4cb97c7390a41a4afa690768f77e59ff6344..612744bf3ebd614aeb392a0b44c3a245b6a6f596 100644
--- a/Source/core/editing/VisiblePosition.h
+++ b/Source/core/editing/VisiblePosition.h
@@ -76,7 +76,6 @@ public:
     // and make constructors to have private accessibility, since constructors
     // aren't simple, e.g. they update layout tree.
     explicit VisiblePosition(const Position&, TextAffinity = VP_DEFAULT_AFFINITY);
-    explicit VisiblePosition(const PositionWithAffinity&);
 
     // Node: Other than |visiblePositionOf()|, we should not use
     // |createWithoutCanonicalization()|.
@@ -146,6 +145,7 @@ PositionInComposedTreeWithAffinity honorEditingBoundaryAtOrBeforeOf(const Positi
 VisiblePosition honorEditingBoundaryAtOrAfter(const VisiblePosition&, const Position& anchor);
 
 CORE_EXPORT VisiblePosition visiblePositionOf(const Position&, TextAffinity = VP_DEFAULT_AFFINITY);
+CORE_EXPORT VisiblePosition visiblePositionOf(const PositionWithAffinity&);
 CORE_EXPORT VisiblePosition visiblePositionOf(const PositionInComposedTree&, TextAffinity = VP_DEFAULT_AFFINITY);
 
 } // namespace blink