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

Source/core/rendering/RenderTableCell.cpp

Index: Source/core/rendering/RenderTableCell.cpp
diff --git a/Source/core/rendering/RenderTableCell.cpp b/Source/core/rendering/RenderTableCell.cpp
index a9b9d21fb05d8af6dc6bc44cff961e27934bc78d..332dbd89b791570664c29fbe5f2dc298b43e0db7 100644
--- a/Source/core/rendering/RenderTableCell.cpp
+++ b/Source/core/rendering/RenderTableCell.cpp
@@ -385,13 +385,12 @@ LayoutUnit RenderTableCell::cellBaselinePosition() const
 void RenderTableCell::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
 {
     ASSERT(style()->display() == TABLE_CELL);
-    ASSERT(!row() || row()->rowIndexWasSet());
 
     RenderBlockFlow::styleDidChange(diff, oldStyle);
     setHasBoxDecorationBackground(true);
 
     if (parent() && section() && oldStyle && style()->height() != oldStyle->height())
-        section()->rowLogicalHeightChanged(rowIndex());
+        section()->rowLogicalHeightChanged(row());
 
     // Our intrinsic padding pushes us down to align with the baseline of other cells on the row. If our vertical-align
     // has changed then so will the padding needed to align with other cells - clear it so we can recalculate it from scratch.