Make VisiblePosition constructor private

Source/core/editing/VisiblePosition.cpp

Index: Source/core/editing/VisiblePosition.cpp
diff --git a/Source/core/editing/VisiblePosition.cpp b/Source/core/editing/VisiblePosition.cpp
index 3d4e30c79d2a2641699c16a212b44e5ac9ed3006..7a59ea3280ee0ec5fdcf64e5f6ba270f2b215fe7 100644
--- a/Source/core/editing/VisiblePosition.cpp
+++ b/Source/core/editing/VisiblePosition.cpp
@@ -222,7 +222,7 @@ VisiblePosition leftPositionOf(const VisiblePosition& visiblePosition)
     if (pos.atStartOfTree() || pos.atEndOfTree())
         return VisiblePosition();
 
-    VisiblePosition left = VisiblePosition(pos);
+    VisiblePosition left = createVisiblePosition(pos);
     ASSERT(left.deepEquivalent() != visiblePosition.deepEquivalent());
 
     return directionOfEnclosingBlock(left.deepEquivalent()) == LTR ? honorEditingBoundaryAtOrBefore(left, visiblePosition.deepEquivalent()) : honorEditingBoundaryAtOrAfter(left, visiblePosition.deepEquivalent());
@@ -389,7 +389,7 @@ VisiblePosition rightPositionOf(const VisiblePosition& visiblePosition)
     if (pos.atStartOfTree() || pos.atEndOfTree())
         return VisiblePosition();
 
-    VisiblePosition right = VisiblePosition(pos);
+    VisiblePosition right = createVisiblePosition(pos);
     ASSERT(right.deepEquivalent() != visiblePosition.deepEquivalent());
 
     return directionOfEnclosingBlock(right.deepEquivalent()) == LTR ? honorEditingBoundaryAtOrAfter(right, visiblePosition.deepEquivalent()) : honorEditingBoundaryAtOrBefore(right, visiblePosition.deepEquivalent());