Expand system font values during property parsing.

Source/core/css/resolver/StyleResolver.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 1235 matching lines @@
 // lastCSSPropertyId<HighPriorityProperties>.
 template<> CSSPropertyID StyleResolver::firstCSSPropertyId<StyleResolver::HighPriorityProperties>()
 {
     COMPILE_ASSERT(CSSPropertyColor == firstCSSProperty, CSS_color_is_first_high_priority_property);
     return CSSPropertyColor;
 }
 
 // This method returns the last CSSPropertyId of high priority properties.
 template<> CSSPropertyID StyleResolver::lastCSSPropertyId<StyleResolver::HighPriorityProperties>()
 {
-    COMPILE_ASSERT(CSSPropertyLineHeight == CSSPropertyColor + 18, CSS_line_height_is_end_of_high_prioity_property_range);
+    COMPILE_ASSERT(CSSPropertyLineHeight == CSSPropertyColor + 17, CSS_line_height_is_end_of_high_prioity_property_range);
     COMPILE_ASSERT(CSSPropertyZoom == CSSPropertyLineHeight - 1, CSS_zoom_is_before_line_height);
     return CSSPropertyLineHeight;
 }
 
 // This method returns the first CSSPropertyId of remaining properties,
 // i.e. low priority properties. No properties depend on low priority
 // properties. So we don't need to resolve such properties quickly.
 // All low priority properties are obtained by using
 // firstCSSPropertyId<LowPriorityProperties> and
 // lastCSSPropertyId<LowPriorityProperties>.
@@ skipping 325 matching lines @@
     visitor->trace(m_uncommonAttributeRuleSet);
     visitor->trace(m_watchedSelectorsRules);
     visitor->trace(m_treeBoundaryCrossingRules);
     visitor->trace(m_styleSharingLists);
     visitor->trace(m_pendingStyleSheets);
     visitor->trace(m_document);
 #endif
 }
 
 } // namespace blink