Use plain int for borders widths when possible

Source/core/layout/LayoutTable.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, 2013 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 899 matching lines @@
 
 int LayoutTable::calcBorderStart() const
 {
     if (!collapseBorders())
         return LayoutBlock::borderStart();
 
     // Determined by the first cell of the first row. See the CSS 2.1 spec, section 17.6.2.
     if (!numEffCols())
         return 0;
 
-    unsigned borderWidth = 0;
+    int borderWidth = 0;
 
     const BorderValue& tableStartBorder = style()->borderStart();
     if (tableStartBorder.style() == BHIDDEN)
         return 0;
     if (tableStartBorder.style() > BHIDDEN)
         borderWidth = tableStartBorder.width();
 
     if (LayoutTableCol* column = colElement(0)) {
         // FIXME: We don't account for direction on columns and column groups.
         const BorderValue& columnAdjoiningBorder = column->style()->borderStart();
@@ skipping 33 matching lines @@
 
 int LayoutTable::calcBorderEnd() const
 {
     if (!collapseBorders())
         return LayoutBlock::borderEnd();
 
     // Determined by the last cell of the first row. See the CSS 2.1 spec, section 17.6.2.
     if (!numEffCols())
         return 0;
 
-    unsigned borderWidth = 0;
+    int borderWidth = 0;
 
     const BorderValue& tableEndBorder = style()->borderEnd();
     if (tableEndBorder.style() == BHIDDEN)
         return 0;
     if (tableEndBorder.style() > BHIDDEN)
         borderWidth = tableEndBorder.width();
 
     unsigned endColumn = numEffCols() - 1;
     if (LayoutTableCol* column = colElement(endColumn)) {
         // FIXME: We don't account for direction on columns and column groups.
@@ skipping 431 matching lines @@
                         cell->invalidateDisplayItemClient(*cell);
                 }
             }
         }
     }
 
     LayoutBlock::invalidatePaintOfSubtreesIfNeeded(childPaintInvalidationState);
 }
 
 }