Tables with specific merge cell configuration render with extra height to tr elements.

Source/core/rendering/RenderTableSection.h

 /*
  * Copyright (C) 1997 Martin Jones (mjones@kde.org)
  *           (C) 1997 Torben Weis (weis@kde.org)
  *           (C) 1998 Waldo Bastian (bastian@kde.org)
  *           (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2009, 2013 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 242 matching lines @@
 
     virtual void paintObject(const PaintInfo&, const LayoutPoint&) override;
 
     virtual void imageChanged(WrappedImagePtr, const IntRect* = 0) override;
 
     int borderSpacingForRow(unsigned row) const { return m_grid[row].rowRenderer ? table()->vBorderSpacing() : 0; }
 
     void ensureRows(unsigned);
 
     bool rowHasOnlySpanningCells(unsigned);
-    unsigned calcRowHeightHavingOnlySpanningCells(unsigned);
-    void updateRowsHeightHavingOnlySpanningCells(RenderTableCell*, struct SpanningRowsHeight&);
-    bool isHeightNeededForRowHavingOnlySpanningCells(unsigned);
+    unsigned calcRowHeightHavingOnlySpanningCells(unsigned, int&, unsigned, unsigned&, Vector<int>&);
+    void updateRowsHeightHavingOnlySpanningCells(RenderTableCell*, struct SpanningRowsHeight&, unsigned&, Vector<int>&);
 
     void populateSpanningRowsHeightFromCell(RenderTableCell*, struct SpanningRowsHeight&);
     void distributeExtraRowSpanHeightToPercentRows(RenderTableCell*, int, int&, Vector<int>&);
     void distributeWholeExtraRowSpanHeightToPercentRows(RenderTableCell*, int, int&, Vector<int>&);
     void distributeExtraRowSpanHeightToAutoRows(RenderTableCell*, int, int&, Vector<int>&);
     void distributeExtraRowSpanHeightToRemainingRows(RenderTableCell*, int, int&, Vector<int>&);
     void distributeRowSpanHeightToRows(SpanningRenderTableCells& rowSpanCells);
 
     void distributeExtraLogicalHeightToPercentRows(int& extraLogicalHeight, int totalPercent);
     void distributeExtraLogicalHeightToAutoRows(int& extraLogicalHeight, unsigned autoRowsCount);
@@ skipping 52 matching lines @@
 namespace WTF {
 
 template<> struct VectorTraits<blink::RenderTableSection::RowStruct> : VectorTraitsBase<blink::RenderTableSection::RowStruct> {
     static const bool needsDestruction = false;
 };
 
 } // namespace WTF
 #endif
 
 #endif // RenderTableSection_h