Fix serialization of content property to always quote

Source/core/css/CSSValuePool.cpp

 /*
  * Copyright (C) 2011, 2012 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 112 matching lines @@
 
 PassRefPtrWillBeRawPtr<CSSPrimitiveValue> CSSValuePool::createValue(const Length& value, const LayoutStyle& style)
 {
     return CSSPrimitiveValue::create(value, style.effectiveZoom());
 }
 
 PassRefPtrWillBeRawPtr<CSSPrimitiveValue> CSSValuePool::createFontFamilyValue(const String& familyName)
 {
     RefPtrWillBeMember<CSSPrimitiveValue>& value = m_fontFamilyValueCache.add(familyName, nullptr).storedValue->value;
     if (!value)
-        value = CSSPrimitiveValue::create(familyName, CSSPrimitiveValue::CSS_STRING);
+        value = CSSPrimitiveValue::create(familyName, CSSPrimitiveValue::CSS_CUSTOM_IDENT);

[Timothy Loh, 2015/03/03 23:20:15]

probably still CSS_STRING

     return value;
 }
 
 PassRefPtrWillBeRawPtr<CSSValueList> CSSValuePool::createFontFaceValue(const AtomicString& string)
 {
     // Just wipe out the cache and start rebuilding if it gets too big.
     const unsigned maximumFontFaceCacheSize = 128;
     if (m_fontFaceValueCache.size() > maximumFontFaceCacheSize)
         m_fontFaceValueCache.clear();
 
@@ skipping 20 matching lines @@
     visitor->trace(m_colorBlack);
     visitor->trace(m_pixelValueCache);
     visitor->trace(m_percentValueCache);
     visitor->trace(m_numberValueCache);
     visitor->trace(m_fontFaceValueCache);
     visitor->trace(m_fontFamilyValueCache);
 #endif
 }
 
 }