Make style building for 'font-size' less custom.

Source/core/css/FontSize.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 110 matching lines @@
 static const float fontSizeFactors[totalKeywords] = { 0.60f, 0.75f, 0.89f, 1.0f, 1.2f, 1.5f, 2.0f, 3.0f };
 
 static int inline rowFromMediumFontSizeInRange(const Settings* settings, bool quirksMode, FixedPitchFontType fixedPitchFontType, int& mediumSize)
 {
     mediumSize = fixedPitchFontType == FixedPitchFont ? settings->defaultFixedFontSize() : settings->defaultFontSize();
     if (mediumSize >= fontSizeTableMin && mediumSize <= fontSizeTableMax)
         return mediumSize - fontSizeTableMin;
     return -1;
 }
 
-float FontSize::fontSizeForKeyword(const Document* document, CSSValueID keyword, FixedPitchFontType fixedPitchFontType)
+float FontSize::fontSizeForKeyword(const Document* document, unsigned keyword, FixedPitchFontType fixedPitchFontType)
 {
-    ASSERT(keyword >= CSSValueXxSmall && keyword <= CSSValueWebkitXxxLarge);
+    ASSERT(keyword >= 1 && keyword <= 8);
     const Settings* settings = document->settings();
     if (!settings)
         return 1.0f;
 
     bool quirksMode = document->inQuirksMode();
     int mediumSize = 0;
     int row = rowFromMediumFontSizeInRange(settings, quirksMode, fixedPitchFontType, mediumSize);
     if (row >= 0) {
-        int col = (keyword - CSSValueXxSmall);
+        int col = (keyword - 1);
         return quirksMode ? quirksFontSizeTable[row][col] : strictFontSizeTable[row][col];
     }
 
     // Value is outside the range of the table. Apply the scale factor instead.
     float minLogicalSize = std::max(settings->minimumLogicalFontSize(), 1);
-    return std::max(fontSizeFactors[keyword - CSSValueXxSmall] * mediumSize, minLogicalSize);
+    return std::max(fontSizeFactors[keyword - 1] * mediumSize, minLogicalSize);
 }
 
 
 
 template<typename T>
 static int findNearestLegacyFontSize(int pixelFontSize, const T* table, int multiplier)
 {
     // Ignore table[0] because xx-small does not correspond to any legacy font size.
     for (int i = 1; i < totalKeywords - 1; i++) {
         if (pixelFontSize * 2 < (table[i] + table[i + 1]) * multiplier)
@@ skipping 11 matching lines @@
     bool quirksMode = document->inQuirksMode();
     int mediumSize = 0;
     int row = rowFromMediumFontSizeInRange(settings, quirksMode, fixedPitchFontType, mediumSize);
     if (row >= 0)
         return findNearestLegacyFontSize<int>(pixelFontSize, quirksMode ? quirksFontSizeTable[row] : strictFontSizeTable[row], 1);
 
     return findNearestLegacyFontSize<float>(pixelFontSize, fontSizeFactors, mediumSize);
 }
 
 } // namespace blink