Changed the C++ includes to the equivalent of nsIURI and nsIStreamListener IDL versions. I couldn't find them earlier. Thanks to andreas.otte@primus-online.de for pointing the availability of them out to me.

uriloader/base/nsIURIContentListener.idl

@@ -30,16 +30,8 @@
 #include "nsISupports.idl"
 #include "nsIProtocolHandler.idl"
 #include "nsIChannel.idl"
-//#include "nsIStreamListener.idl" This should be available!
-//#incldue "nsIURI.idl" This should be available!
-interface nsIStreamListener;
-interface nsIURI;
-
-%{ C++
-#include "nsIStreamListener.h"
-#include "nsIURI.h"
-%}
-
+#include "nsIStreamListener.idl"
+#include "nsIURI.idl"
 
 [scriptable, uuid(94928AB3-8B63-11d3-989D-001083010E9B)]
 interface nsIURIContentListener : nsISupports