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

Source/core/css/resolver/FontBuilder.h

Index: Source/core/css/resolver/FontBuilder.h
diff --git a/Source/core/css/resolver/FontBuilder.h b/Source/core/css/resolver/FontBuilder.h
index e4a9cafac0c535946e2fcdaa6f9f0ccc4c9c697f..f325a8a614bf10150ccf1d7a203dab2f456b68d5 100644
--- a/Source/core/css/resolver/FontBuilder.h
+++ b/Source/core/css/resolver/FontBuilder.h
@@ -63,10 +63,7 @@ public:
 
     void setWeight(FontWeight);
     void setStretch(FontStretch);
-
-    void setFeatureSettingsNormal();
-    void setFeatureSettingsValue(CSSValue*);
-
+    void setFeatureSettings(PassRefPtr<FontFeatureSettings>);
     void setScript(const String& locale);
     void setStyle(FontStyle);
     void setVariant(FontVariant);
@@ -88,6 +85,7 @@ public:
     // FIXME: This is only used by an ASSERT in StyleResolver. Remove?
     bool fontDirty() const { return m_fontDirty; }
 
+    static FontFeatureSettings* initialFeatureSettings() { return nullptr; }
     static FontDescription::GenericFamilyType initialGenericFamily() { return FontDescription::NoFamily; }
     static TextRenderingMode initialTextRendering() { return AutoTextRendering; }
     static FontVariant initialVariant() { return FontVariantNormal; }