Remove custom style building for -webkit-font-feature-settings.

Source/platform/fonts/FontDescription.cpp

 /*
  * Copyright (C) 2007 Nicholas Shanks <contact@nickshanks.com>
  * Copyright (C) 2008 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 113 matching lines @@
 void FontDescription::setVariantLigatures(const VariantLigatures& ligatures)
 {
     m_commonLigaturesState = ligatures.common;
     m_discretionaryLigaturesState = ligatures.discretionary;
     m_historicalLigaturesState = ligatures.historical;
     m_contextualLigaturesState = ligatures.contextual;
 
     updateTypesettingFeatures();
 }
 
-FontDescription FontDescription::makeNormalFeatureSettings() const
-{
-    FontDescription normalDescription(*this);
-    normalDescription.setFeatureSettings(nullptr);
-    return normalDescription;
-}
-
 float FontDescription::effectiveFontSize() const
 {
     float size = (RuntimeEnabledFeatures::subpixelFontScalingEnabled())
         ? computedSize()
         : computedPixelSize();
 
     // Ensure that the effective precision matches the font-cache precision.
     // This guarantees that the same precision is used regardless of cache status.
     return floorf(size * FontCacheKey::precisionMultiplier()) / FontCacheKey::precisionMultiplier();
 }
@@ skipping 69 matching lines @@
 
         if (discretionaryLigaturesState() == FontDescription::EnabledLigaturesState
             || historicalLigaturesState() == FontDescription::EnabledLigaturesState
             || contextualLigaturesState() == FontDescription::EnabledLigaturesState) {
             m_typesettingFeatures |= blink::Ligatures;
         }
     }
 }
 
 } // namespace blink