fix bustage

37408
String bundle doesn't offer a scriptable enumerator
r=be

xpcom/ds/MANIFEST

@@ -9,6 +9,7 @@ nsHashtableEnumerator.h
 nsIArena.h
 nsIByteBuffer.h
 nsIObserverList.h
+nsIPersistentProperties.h
 nsISimpleEnumerator.h
 nsISizeOfHandler.h
 nsIUnicharBuffer.h