Table headers are not retrieved properly by Accessibility API

Source/modules/accessibility/AXTableCell.h

Index: Source/modules/accessibility/AXTableCell.h
diff --git a/Source/modules/accessibility/AXTableCell.h b/Source/modules/accessibility/AXTableCell.h
index d0a36af71273cc1fdb0ff5f07836549439f66d5b..ea9644a0ae6d047d053cec2c75e1b344018c4d76 100644
--- a/Source/modules/accessibility/AXTableCell.h
+++ b/Source/modules/accessibility/AXTableCell.h
@@ -51,6 +51,7 @@ public:
     // fills in the start location and column span of cell
     virtual void columnIndexRange(pair<unsigned, unsigned>& columnRange);
 
+    AccessibilityRole scanToDecideHeaderRole();
 protected:
     virtual AXObject* parentTable() const;
     int m_rowIndex;
@@ -61,7 +62,6 @@ private:
     bool isRowHeaderCell() const;
     bool isColumnHeaderCell() const;
 
-    AccessibilityRole scanToDecideHeaderRole();
     // If a table cell is not exposed as a table cell, a TH element can serve as its title UI element.
     virtual AXObject* titleUIElement() const override final;
     virtual bool exposesTitleUIElement() const override final { return true; }