Do not expose auto as value of widows

Source/core/css/CSSComputedStyleDeclaration.cpp

 /*
  * Copyright (C) 2004 Zack Rusin <zack@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
  * Copyright (C) 2011 Sencha, Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
@@ skipping 2299 matching lines @@
                 case LENGTH:
                     return zoomAdjustedPixelValueForLength(style->verticalAlignLength(), *style);
             }
             ASSERT_NOT_REACHED();
             return nullptr;
         case CSSPropertyVisibility:
             return cssValuePool().createValue(style->visibility());
         case CSSPropertyWhiteSpace:
             return cssValuePool().createValue(style->whiteSpace());
         case CSSPropertyWidows:
-            if (style->hasAutoWidows())
-                return cssValuePool().createIdentifierValue(CSSValueAuto);
             return cssValuePool().createValue(style->widows(), CSSPrimitiveValue::CSS_NUMBER);
         case CSSPropertyWidth:
             if (renderer) {
                 // According to http://www.w3.org/TR/CSS2/visudet.html#the-width-property,
                 // the "width" property does not apply for non-replaced inline elements.
                 if (!renderer->isReplaced() && renderer->isInline())
                     return cssValuePool().createIdentifierValue(CSSValueAuto);
                 return zoomAdjustedPixelValue(sizingBox(renderer).width(), *style);
             }
             return zoomAdjustedPixelValueForLength(style->width(), *style);
@@ skipping 731 matching lines @@
     return list.release();
 }
 
 void CSSComputedStyleDeclaration::trace(Visitor* visitor)
 {
     visitor->trace(m_node);
     CSSStyleDeclaration::trace(visitor);
 }
 
 } // namespace blink