Remove code in PropertyValueForSerializer

Source/core/css/StylePropertySerializer.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Research In Motion Limited. All rights reserved.
  * Copyright (C) 2013 Intel Corporation. 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.
@@ skipping 67 matching lines @@
 
     CSSPropertyID propertyID = static_cast<CSSPropertyID>(index + firstCSSProperty);
     ASSERT(firstCSSProperty <= propertyID && propertyID <= lastCSSProperty);
     if (m_longhandPropertyUsed.get(index)) {
         int index = m_propertySet.findPropertyIndex(propertyID);
         ASSERT(index != -1);
         return StylePropertySerializer::PropertyValueForSerializer(m_propertySet.propertyAt(index));
     }
 
     StylePropertySet::PropertyReference property = m_propertySet.propertyAt(m_allIndex);
-    const CSSValue* value = property.value();
-
-    // FIXME: Firefox shows properties with "unset" when some cssRule has
-    // expanded "all" with "unset". So we should use "unset" here.
-    // After implementing "unset" value correctly, (i.e. StyleBuilder should
-    // support "display: unset", "color: unset", ... and so on),
-    // we should fix the following code.
-    if (!value->isInitialValue() && !value->isInheritedValue()) {
-        if (CSSPropertyMetadata::isInheritedProperty(propertyID))
-            value = cssValuePool().createInheritedValue().get();
-        else
-            value = cssValuePool().createExplicitInitialValue().get();
-    }
-    return StylePropertySerializer::PropertyValueForSerializer(propertyID, value, property.isImportant());
+    return StylePropertySerializer::PropertyValueForSerializer(propertyID, property.value(), property.isImportant());
 }
 
 bool StylePropertySerializer::StylePropertySetForSerializer::shouldProcessPropertyAt(unsigned index) const
 {
     // StylePropertySet has all valid longhands. We should process.
     if (!hasAllProperty())
         return true;
 
     // If all is not expanded, we need to process "all" and properties which
     // are not overwritten by "all".
@@ skipping 904 matching lines @@
             isInitialValue = false;
         if (!value->isInheritedValue())
             isInheritedValue = false;
         if (isImportant != m_propertySet.propertyIsImportant(shorthand.properties()[i]))
             return false;
     }
     return isInitialValue || isInheritedValue;
 }
 
 }