Row with only spanning cells have a height of 0.

Source/core/rendering/RenderTableSection.h

Index: Source/core/rendering/RenderTableSection.h
diff --git a/Source/core/rendering/RenderTableSection.h b/Source/core/rendering/RenderTableSection.h
index 2707d74ce1dbf91b934b00f5ef67a322d7db2266..6e02deddae085f9a96489919e5b29a46b48af50b 100644
--- a/Source/core/rendering/RenderTableSection.h
+++ b/Source/core/rendering/RenderTableSection.h
@@ -129,12 +129,14 @@ public:
         SpanningRowsHeight()
             : totalRowsHeight(0)
             , spanningCellHeightIgnoringBorderSpacing(0)
+            , rowWithOnlySpanningCells(false)
         {
         }
 
         Vector<int> rowHeight;
         int totalRowsHeight;
         int spanningCellHeightIgnoringBorderSpacing;
+        bool rowWithOnlySpanningCells;
     };
 
     const BorderValue& borderAdjoiningTableStart() const
@@ -241,6 +243,10 @@ private:
 
     void ensureRows(unsigned);
 
+    bool rowHasOnlySpanningCells(unsigned);
+    unsigned calcRowHeightHavingOnlySpanningCells(unsigned);
+    void updateRowsHeightHavingOnlySpanningCells(RenderTableCell*, struct SpanningRowsHeight&);
+
     void populateSpanningRowsHeightFromCell(RenderTableCell*, struct SpanningRowsHeight&);
     void distributeExtraRowSpanHeightToPercentRows(RenderTableCell*, int, int&, Vector<int>&);
     void distributeExtraRowSpanHeightToAutoRows(RenderTableCell*, int, int&, Vector<int>&);