Issue #1221: Pass the original element into

nsXMLContentSerializer::CheckElementEnd so that we can properly
determine whether it has children.

This resolves #1221

dom/base/nsPlainTextSerializer.cpp

@@ -390,6 +390,7 @@ nsPlainTextSerializer::AppendElementStart(Element* aElement,
  
 NS_IMETHODIMP 
 nsPlainTextSerializer::AppendElementEnd(Element* aElement,
+                                        Element* aOriginalElement /* unused */,
                                         nsAString& aStr)
 {
   NS_ENSURE_ARG(aElement);