Use tighter typing in editing: VisiblePosition & VisibleSelection

Source/core/editing/DeleteSelectionCommand.cpp

Index: Source/core/editing/DeleteSelectionCommand.cpp
diff --git a/Source/core/editing/DeleteSelectionCommand.cpp b/Source/core/editing/DeleteSelectionCommand.cpp
index a5856c957ab7bd59897b0fb8b15a0e12737898b9..ec1173d29d05bfef3ab52e092c01febc468c0561 100644
--- a/Source/core/editing/DeleteSelectionCommand.cpp
+++ b/Source/core/editing/DeleteSelectionCommand.cpp
@@ -800,7 +800,7 @@ void DeleteSelectionCommand::doApply()
         // Don't need a placeholder when deleting a selection that starts just before a table
         // and ends inside it (we do need placeholders to hold open empty cells, but that's
         // handled elsewhere).
-        if (Node* table = isLastPositionBeforeTable(m_selectionToDelete.visibleStart()))
+        if (Element* table = isLastPositionBeforeTable(m_selectionToDelete.visibleStart()))
             if (m_selectionToDelete.end().deprecatedNode()->isDescendantOf(table))
                 m_needPlaceholder = false;
     }