Return table headers for aria tables.

Source/modules/accessibility/AXTableRow.h

Index: Source/modules/accessibility/AXTableRow.h
diff --git a/Source/modules/accessibility/AXTableRow.h b/Source/modules/accessibility/AXTableRow.h
index bfdab550d441cdbbd5de4e5483b3e7f906d3cbcd..2fc12ffb0e5c2781aaeb0fbd7736904c66c20db3 100644
--- a/Source/modules/accessibility/AXTableRow.h
+++ b/Source/modules/accessibility/AXTableRow.h
@@ -49,7 +49,7 @@ public:
     // retrieves the "row" header (a th tag in the rightmost column)
     virtual AXObject* headerObject();
     // retrieves the "row" headers (th, scope) from left to right for the each row.
-    void headerObjectsForRow(AccessibilityChildrenVector&);
+    virtual void headerObjectsForRow(AccessibilityChildrenVector&);
     AXObject* parentTable() const;
 
     void setRowIndex(int rowIndex) { m_rowIndex = rowIndex; }