Do not treat '0' as 'none' for font-size-adjust

Source/core/layout/style/LayoutStyle.cpp

 /*
  * Copyright (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Adobe Systems Incorporated. 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
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 1168 matching lines @@
     return *rareNonInheritedData->m_transitions;
 }
 
 const Font& LayoutStyle::font() const { return inherited->font; }
 const FontMetrics& LayoutStyle::fontMetrics() const { return inherited->font.fontMetrics(); }
 const FontDescription& LayoutStyle::fontDescription() const { return inherited->font.fontDescription(); }
 float LayoutStyle::specifiedFontSize() const { return fontDescription().specifiedSize(); }
 float LayoutStyle::computedFontSize() const { return fontDescription().computedSize(); }
 int LayoutStyle::fontSize() const { return fontDescription().computedPixelSize(); }
 float LayoutStyle::fontSizeAdjust() const { return fontDescription().sizeAdjust(); }
-bool LayoutStyle::hasFontSizeAdjust() const { return fontDescription().sizeAdjust() > 0; }
+bool LayoutStyle::hasFontSizeAdjust() const { return fontDescription().hasSizeAdjust(); }
 FontWeight LayoutStyle::fontWeight() const { return fontDescription().weight(); }
 FontStretch LayoutStyle::fontStretch() const { return fontDescription().stretch(); }
 
 TextDecoration LayoutStyle::textDecorationsInEffect() const
 {
     int decorations = 0;
 
     const Vector<AppliedTextDecoration>& applied = appliedTextDecorations();
 
     for (size_t i = 0; i < applied.size(); ++i)
@@ skipping 522 matching lines @@
         horizontal || includeLogicalRightEdge);
 
     edges[BSLeft] = BorderEdge(borderLeftWidth(),
         visitedDependentColor(CSSPropertyBorderLeftColor),
         borderLeftStyle(),
         borderLeftIsTransparent(),
         !horizontal || includeLogicalLeftEdge);
 }
 
 } // namespace blink