Bug 305949 - stop exporting nonfrozen XPCOM symbols when libxul is enabled, r=darin

xpcom/base/nscore.h

@@ -274,9 +274,7 @@
 #define XPCOM_API(type) IMPORT_XPCOM_API(type)
 #endif
 
-#if 0
-/* This will become #ifdef MOZ_ENABLE_LIBXUL when various in-tree code is
-   fixed up. See bug 305949 */
+#ifdef MOZ_ENABLE_LIBXUL
 #define NS_COM
 #elif defined(_IMPL_NS_COM)
 #define NS_COM NS_EXPORT