Remove custom style building for font-variant-ligatures.

Source/platform/fonts/FontDescription.cpp

Index: Source/platform/fonts/FontDescription.cpp
diff --git a/Source/platform/fonts/FontDescription.cpp b/Source/platform/fonts/FontDescription.cpp
index d5fad42b525a26d057f6288d25ea6649b66da1a9..829d815d24a66b92979278a8484d180831b93b64 100644
--- a/Source/platform/fonts/FontDescription.cpp
+++ b/Source/platform/fonts/FontDescription.cpp
@@ -101,6 +101,18 @@ FontTraits FontDescription::traits() const
     return FontTraits(style(), variant(), weight(), stretch());
 }
 
+FontDescription::VariantLigatures FontDescription::variantLigatures() const
+{
+    VariantLigatures ligatures;
+
+    ligatures.common = commonLigaturesState();
+    ligatures.discretionary = discretionaryLigaturesState();
+    ligatures.historical = historicalLigaturesState();
+    ligatures.contextual = contextualLigaturesState();
+
+    return ligatures;
+}
+
 void FontDescription::setTraits(FontTraits traits)
 {
     setStyle(traits.style());
@@ -109,6 +121,16 @@ void FontDescription::setTraits(FontTraits traits)
     setStretch(traits.stretch());
 }
 
+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);