Don't use rowIndex() if needsCellRecalc().

Source/core/rendering/RenderTableRow.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 52 matching lines @@
         if (UNLIKELY(rowIndex > maxRowIndex))
             CRASH();
 
         m_rowIndex = rowIndex;
     }
 
     bool rowIndexWasSet() const { return m_rowIndex != unsetRowIndex; }
     unsigned rowIndex() const
     {
         ASSERT(rowIndexWasSet());
+        ASSERT(!section() || !section()->needsCellRecalc()); // index may be bogus if cells need recalc.
         return m_rowIndex;
     }
 
     const BorderValue& borderAdjoiningTableStart() const
     {
         if (section()->hasSameDirectionAs(table()))
             return style()->borderStart();
 
         return style()->borderEnd();
     }
@@ skipping 68 matching lines @@
 
 inline RenderTableRow* RenderTableSection::lastRow() const
 {
     ASSERT(children() == virtualChildren());
     return toRenderTableRow(children()->lastChild());
 }
 
 } // namespace blink
 
 #endif // RenderTableRow_h