Make non-null VisibleSelections creatable only by createVisibleSelection[Deprecated]

third_party/WebKit/Source/core/editing/PendingSelection.cpp

Index: third_party/WebKit/Source/core/editing/PendingSelection.cpp
diff --git a/third_party/WebKit/Source/core/editing/PendingSelection.cpp b/third_party/WebKit/Source/core/editing/PendingSelection.cpp
index a0ce47623cc5323286a52253b4aaef3c798ef531..171560d7703137e7ea9bc51c99b7f8d4a6c9c395 100644
--- a/third_party/WebKit/Source/core/editing/PendingSelection.cpp
+++ b/third_party/WebKit/Source/core/editing/PendingSelection.cpp
@@ -76,10 +76,10 @@ VisibleSelectionInFlatTree PendingSelection::calcVisibleSelection(const VisibleS
     if (paintBlockCursor) {
         VisiblePositionInFlatTree visibleExtent = createVisiblePosition(end, affinity);
         visibleExtent = nextPositionOf(visibleExtent, CanSkipOverEditingBoundary);
-        return VisibleSelectionInFlatTree(visibleStart, visibleExtent);
+        return createVisibleSelectionDeprecated(visibleStart, visibleExtent);
     }
     const VisiblePositionInFlatTree visibleEnd = createVisiblePosition(end, selectionType == SelectionType::RangeSelection ? TextAffinity::Upstream : affinity);
-    return VisibleSelectionInFlatTree(visibleStart, visibleEnd);
+    return createVisibleSelectionDeprecated(visibleStart, visibleEnd);
 }
 
 void PendingSelection::commit(LayoutView& layoutView)