Don't add artifical 1 pixel width to empty tables

Source/core/layout/TableLayoutAlgorithmAuto.h

 /*
  * Copyright (C) 2002 Lars Knoll (knoll@kde.org)
  *           (C) 2002 Dirk Mueller (mueller@kde.org)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 15 matching lines @@
 #include "platform/Length.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 class LayoutTable;
 class LayoutTableCell;
 
 enum CellsToProcess {
     AllCells,
-    NonEmptyCells
+    NonEmptyCells,
+    EmptyCells
 };
 
 enum DistributionMode {
     ExtraWidth,
     InitialWidth,
     LeftoverWidth
 };
 
 enum DistributionDirection {
     StartToEnd,
@@ skipping 21 matching lines @@
     void insertSpanCell(LayoutTableCell*);
 
     struct Layout {
         Layout()
             : minLogicalWidth(0)
             , maxLogicalWidth(0)
             , effectiveMinLogicalWidth(0)
             , effectiveMaxLogicalWidth(0)
             , computedLogicalWidth(0)
             , emptyCellsOnly(true)
+            , columnHasNoCells(true)
         {
         }
 
         Length logicalWidth;
         Length effectiveLogicalWidth;
         int minLogicalWidth;
         int maxLogicalWidth;
         int effectiveMinLogicalWidth;
         int effectiveMaxLogicalWidth;
         int computedLogicalWidth;
         bool emptyCellsOnly;
+        bool columnHasNoCells;
+        int clampedEffectiveMaxLogicalWidth() { return std::max<int>(1, effectiveMaxLogicalWidth); }
     };
 
     Vector<Layout, 4> m_layoutStruct;
     Vector<LayoutTableCell*, 4> m_spanCells;
     bool m_hasPercent : 1;
     mutable bool m_effectiveLogicalWidthDirty : 1;
 };
 
 } // namespace blink
 
 #endif // TableLayoutAlgorithmAuto