Store separator info of counters as CSSStringValue

third_party/WebKit/Source/core/css/CSSCounterValue.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/css/CSSCounterValue.h"
 
 #include "core/css/CSSMarkup.h"
 #include "wtf/text/StringBuilder.h"
 
 namespace blink {
 
 String CSSCounterValue::customCSSText() const
 {
     StringBuilder result;
     if (separator().isEmpty())
         result.appendLiteral("counter(");
     else
         result.appendLiteral("counters(");
 
     result.append(identifier());
     if (!separator().isEmpty()) {
         result.appendLiteral(", ");
-        result.append(serializeString(separator()));
+        result.append(m_separator->cssText());
     }
     bool isDefaultListStyle = listStyle() == CSSValueDecimal;
     if (!isDefaultListStyle) {
         result.appendLiteral(", ");
         result.append(m_listStyle->cssText());
     }
     result.append(')');
 
     return result.toString();
 }
 
 DEFINE_TRACE_AFTER_DISPATCH(CSSCounterValue)
 {
     visitor->trace(m_identifier);
     visitor->trace(m_listStyle);
     visitor->trace(m_separator);
     CSSValue::traceAfterDispatch(visitor);
 }
 
 } // namespace blink