Fix spanning cell painting background from wrong row

third_party/WebKit/Source/core/paint/TableSectionPainter.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef TableSectionPainter_h
 #define TableSectionPainter_h
 
 #include "core/paint/PaintPhase.h"
 #include "core/style/ShadowData.h"
 #include "wtf/Allocator.h"
 
 namespace blink {
 
-class CellSpan;
 class CollapsedBorderValue;
 class LayoutPoint;
 class LayoutTableCell;
 class LayoutTableSection;
 struct PaintInfo;
 
 class TableSectionPainter {
   STACK_ALLOCATED();
 
  public:
   TableSectionPainter(const LayoutTableSection& layoutTableSection)
       : m_layoutTableSection(layoutTableSection) {}
 
   void paint(const PaintInfo&, const LayoutPoint&);
   void paintCollapsedBorders(const PaintInfo&,
                              const LayoutPoint&,
                              const CollapsedBorderValue&);
 
  private:
   void paintObject(const PaintInfo&, const LayoutPoint&);
 
   void paintBackgroundsBehindCell(const LayoutTableCell&,
                                   const PaintInfo&,
                                   const LayoutPoint&);
   void paintCell(const LayoutTableCell&, const PaintInfo&, const LayoutPoint&);
   void paintBoxShadow(const PaintInfo&, const LayoutPoint&, ShadowStyle);
 
-  // Returns the primary cell that should be painted for the grid item at (row,
-  // column) intersecting dirtiedRows and dirtiedColumns. Returns nullptr if we
-  // have painted the grid item when painting the grid item left to or above
-  // (row, column) when painting cells intersecting dirtiedRows and
-  // dirtiedColumns.
-  const LayoutTableCell* primaryCellToPaint(
-      unsigned row,
-      unsigned column,
-      const CellSpan& dirtiedRows,
-      const CellSpan& dirtiedColumns) const;
-
   enum ItemToPaint { PaintCollapsedBorders, PaintSection };
   void paintRepeatingHeaderGroup(const PaintInfo&,
                                  const LayoutPoint& paintOffset,
                                  const CollapsedBorderValue& currentBorderValue,
                                  ItemToPaint);
   void paintSection(const PaintInfo&, const LayoutPoint&);
   void paintCollapsedSectionBorders(const PaintInfo&,
                                     const LayoutPoint&,
                                     const CollapsedBorderValue&);
 
   const LayoutTableSection& m_layoutTableSection;
 };
 
 }  // namespace blink
 
 #endif  // TableSectionPainter_h