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

Source/core/css/resolver/StyleBuilderConverter.cpp

 /*
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 #include "config.h"
 #include "core/css/resolver/StyleBuilderConverter.h"
 
+#include "core/css/CSSFontFeatureValue.h"
 #include "core/css/CSSFunctionValue.h"
 #include "core/css/CSSGridLineNamesValue.h"
 #include "core/css/CSSPrimitiveValueMappings.h"
 #include "core/css/CSSReflectValue.h"
 #include "core/css/CSSShadowValue.h"
 #include "core/css/Pair.h"
 #include "core/svg/SVGURIReference.h"
 
 namespace blink {
 
@@ skipping 43 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;
 }
 
+PassRefPtr<FontFeatureSettings> StyleBuilderConverter::convertFontFeatureSettings(StyleResolverState& state, CSSValue* value)
+{
+    if (value->isPrimitiveValue() && toCSSPrimitiveValue(value)->getValueID() == CSSValueNormal)
+        return FontBuilder::initialFeatureSettings();
+
+    CSSValueList* list = toCSSValueList(value);
+    RefPtr<FontFeatureSettings> settings = FontFeatureSettings::create();
+    int len = list->length();
+    for (int i = 0; i < len; ++i) {
+        CSSFontFeatureValue* feature = toCSSFontFeatureValue(list->item(i));
+        settings->append(FontFeature(feature->tag(), feature->value()));
+    }
+    return settings;
+}
+
 FontWeight StyleBuilderConverter::convertFontWeight(StyleResolverState& state, CSSValue* value)
 {
     CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
     switch (primitiveValue->getValueID()) {
     case CSSValueBolder:
         return FontDescription::bolderWeight(state.parentStyle()->fontDescription().weight());
     case CSSValueLighter:
         return FontDescription::lighterWeight(state.parentStyle()->fontDescription().weight());
     default:
         return *primitiveValue;
@@ skipping 406 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