Remove custom style building for font-variant-ligatures.

Source/core/css/resolver/StyleBuilderConverter.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
  * copyright notice, this list of conditions and the following disclaimer
  * in the documentation and/or other materials provided with the
  * distribution.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 72 matching lines @@
 }
 
 AtomicString StyleBuilderConverter::convertFragmentIdentifier(StyleResolverState& state, CSSValue* value)
 {
     CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
     if (primitiveValue->isURI())
         return SVGURIReference::fragmentIdentifierFromIRIString(primitiveValue->getStringValue(), state.element()->treeScope());
     return nullAtom;
 }
 
+FontDescription::VariantLigatures StyleBuilderConverter::convertFontVariantLigatures(StyleResolverState&, CSSValue* value)
+{
+    if (value->isValueList()) {
+        FontDescription::VariantLigatures ligatures;
+        CSSValueList* valueList = toCSSValueList(value);
+        for (size_t i = 0; i < valueList->length(); ++i) {
+            CSSValue* item = valueList->item(i);
+            CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(item);
+            switch (primitiveValue->getValueID()) {
+            case CSSValueNoCommonLigatures:
+                ligatures.common = FontDescription::DisabledLigaturesState;
+                break;
+            case CSSValueCommonLigatures:
+                ligatures.common = FontDescription::EnabledLigaturesState;
+                break;
+            case CSSValueNoDiscretionaryLigatures:
+                ligatures.discretionary = FontDescription::DisabledLigaturesState;
+                break;
+            case CSSValueDiscretionaryLigatures:
+                ligatures.discretionary = FontDescription::EnabledLigaturesState;
+                break;
+            case CSSValueNoHistoricalLigatures:
+                ligatures.historical = FontDescription::DisabledLigaturesState;
+                break;
+            case CSSValueHistoricalLigatures:
+                ligatures.historical = FontDescription::EnabledLigaturesState;
+                break;
+            case CSSValueNoContextual:
+                ligatures.contextual = FontDescription::DisabledLigaturesState;
+                break;
+            case CSSValueContextual:
+                ligatures.contextual = FontDescription::EnabledLigaturesState;
+                break;
+            default:
+                ASSERT_NOT_REACHED();
+                break;
+            }
+        }
+        return ligatures;
+    }
+
+    ASSERT_WITH_SECURITY_IMPLICATION(value->isPrimitiveValue());
+    ASSERT(toCSSPrimitiveValue(value)->getValueID() == CSSValueNormal);
+    return FontDescription::VariantLigatures();
+}
+
 EGlyphOrientation StyleBuilderConverter::convertGlyphOrientation(StyleResolverState&, CSSValue* value)
 {
     if (!value->isPrimitiveValue())
         return GO_0DEG;
 
     CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
     if (primitiveValue->primitiveType() != CSSPrimitiveValue::CSS_DEG)
         return GO_0DEG;
 
     float angle = fabsf(fmodf(primitiveValue->getFloatValue(), 360.0f));
@@ skipping 347 matching lines @@
 {
     CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
     if (primitiveValue->getValueID()) {
         float multiplier = convertLineWidth<float>(state, value);
         return CSSPrimitiveValue::create(multiplier / 48, CSSPrimitiveValue::CSS_EMS)->computeLength<float>(state.cssToLengthConversionData());
     }
     return primitiveValue->computeLength<float>(state.cssToLengthConversionData());
 }
 
 } // namespace blink