XIF DTD now depends on a single stack rather than

multiple stacks.
r=akkana
Moved Node recycling to DTD Utils so that the recycler could
be used across DTDs.
r=rickg
Also fixed bug 27136.

parser/htmlparser/src/nsParserModule.cpp

@@ -195,6 +195,7 @@ nsParserModule::Shutdown()
     nsXMLTokenizer::FreeTokenRecycler();
     nsExpatTokenizer::FreeTokenRecycler();
 //    nsTextTokenizer::FreeTokenRecycler();
+    nsDTDContext::FreeNodeRecycler();
     nsParser::FreeSharedObjects();
     mInitialized = PR_FALSE;
   }