Remove code in PropertyValueForSerializer

Source/core/css/StylePropertySerializer.cpp

Index: Source/core/css/StylePropertySerializer.cpp
diff --git a/Source/core/css/StylePropertySerializer.cpp b/Source/core/css/StylePropertySerializer.cpp
index 2bc47a627f706df54d1662d0dd936d8ffe205a15..cbc45113050b8f6eb123170150b846a7c59f5ec1 100644
--- a/Source/core/css/StylePropertySerializer.cpp
+++ b/Source/core/css/StylePropertySerializer.cpp
@@ -85,20 +85,7 @@ StylePropertySerializer::PropertyValueForSerializer StylePropertySerializer::Sty
     }
 
     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