Serialize <string> with double quotes

Source/core/css/CSSPrimitiveValue.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2012 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 1044 matching lines @@
         case CSS_FR:
         case CSS_VW:
         case CSS_VH:
         case CSS_VMIN:
         case CSS_VMAX:
             text = formatNumber(m_value.num, unitTypeToString((UnitType)m_primitiveUnitType));
             break;
         case CSS_CUSTOM_IDENT:
             text = quoteCSSStringIfNeeded(m_value.string);
             break;
-        case CSS_STRING:
-            text = quoteCSSString(m_value.string);
+        case CSS_STRING: {
+            StringBuilder result;
+            serializeString(m_value.string, result);
+            text = result.toString();
             break;
+        }
         case CSS_URI:
             text = "url(" + quoteCSSURLIfNeeded(m_value.string) + ")";
             break;
         case CSS_VALUE_ID:
             text = valueName(m_value.valueID);
             break;
         case CSS_PROPERTY_ID:
             text = propertyName(m_value.propertyID);
             break;
         case CSS_ATTR: {
@@ skipping 146 matching lines @@
         visitor->trace(m_value.shape);
         break;
     default:
         break;
     }
 #endif
     CSSValue::traceAfterDispatch(visitor);
 }
 
 } // namespace blink