Use correct container width as base for percentage margins.

Source/core/rendering/RenderTable.cpp

 /*
  * 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, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 287 matching lines @@
     Length styleMinLogicalWidth = style()->logicalMinWidth();
     if ((styleMinLogicalWidth.isSpecified() && !styleMinLogicalWidth.isNegative()) || styleMinLogicalWidth.isIntrinsic()) {
         LayoutUnit computedMinLogicalWidth = convertStyleLogicalWidthToComputedWidth(styleMinLogicalWidth, availableLogicalWidth);
         setLogicalWidth(max<int>(logicalWidth(), computedMinLogicalWidth));
     }
 
     // Finally, with our true width determined, compute our margins for real.
     setMarginStart(0);
     setMarginEnd(0);
     if (!hasPerpendicularContainingBlock) {
-        LayoutUnit containerLogicalWidthForAutoMargins = availableLogicalWidth;
-        if (avoidsFloats() && cb->containsFloats())
-            containerLogicalWidthForAutoMargins = containingBlockAvailableLineWidth();
         ComputedMarginValues marginValues;
         bool hasInvertedDirection =  cb->style()->isLeftToRightDirection() == style()->isLeftToRightDirection();
-        computeInlineDirectionMargins(cb, containerLogicalWidthForAutoMargins, logicalWidth(),
+        computeInlineDirectionMargins(cb, availableLogicalWidth, logicalWidth(),
             hasInvertedDirection ? marginValues.m_start : marginValues.m_end,
             hasInvertedDirection ? marginValues.m_end : marginValues.m_start);
         setMarginStart(marginValues.m_start);
         setMarginEnd(marginValues.m_end);
     } else {
         setMarginStart(minimumValueForLength(style()->marginStart(), availableLogicalWidth));
         setMarginEnd(minimumValueForLength(style()->marginEnd(), availableLogicalWidth));
     }
 
     // We should NEVER shrink the table below the min-content logical width, or else the table can't accomodate
@@ skipping 1134 matching lines @@
 const BorderValue& RenderTable::tableEndBorderAdjoiningCell(const RenderTableCell* cell) const
 {
     ASSERT(cell->isFirstOrLastCellInRow());
     if (hasSameDirectionAs(cell->row()))
         return style()->borderEnd();
 
     return style()->borderStart();
 }
 
 }