Using Enum in place of bool for better code readability

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 1180 matching lines @@
     if (!style)
         return nullptr;
 
     if (int keywordSize = style->fontDescription().keywordSize())
         return cssValuePool().createIdentifierValue(cssIdentifierForFontSizeKeyword(keywordSize));
 
 
     return zoomAdjustedPixelValue(style->fontDescription().computedPixelSize(), *style);
 }
 
-bool CSSComputedStyleDeclaration::useFixedFontDefaultSize() const
+FixedPitchFontType CSSComputedStyleDeclaration::useFixedFontDefaultSize() const
 {
     if (!m_node)
-        return false;
+        return NonFixedPitchFont;
 
     RefPtr<RenderStyle> style = m_node->computedStyle(m_pseudoElementSpecifier);
     if (!style)
-        return false;
+        return NonFixedPitchFont;
 
     return style->fontDescription().useFixedDefaultSize();
 }
 
 PassRefPtrWillBeRawPtr<CSSValue> CSSComputedStyleDeclaration::valueForShadowData(const ShadowData& shadow, const RenderStyle& style, bool useSpread) const
 {
     RefPtrWillBeRawPtr<CSSPrimitiveValue> x = zoomAdjustedPixelValue(shadow.x(), style);
     RefPtrWillBeRawPtr<CSSPrimitiveValue> y = zoomAdjustedPixelValue(shadow.y(), style);
     RefPtrWillBeRawPtr<CSSPrimitiveValue> blur = zoomAdjustedPixelValue(shadow.blur(), style);
     RefPtrWillBeRawPtr<CSSPrimitiveValue> spread = useSpread ? zoomAdjustedPixelValue(shadow.spread(), style) : PassRefPtrWillBeRawPtr<CSSPrimitiveValue>(nullptr);
@@ skipping 1841 matching lines @@
     return list.release();
 }
 
 void CSSComputedStyleDeclaration::trace(Visitor* visitor)
 {
     visitor->trace(m_node);
     CSSStyleDeclaration::trace(visitor);
 }
 
 } // namespace WebCore