Backed out c8297c309ab3 (Fix for bug 499777 (Cannot convert WrappedNative to function (NS_ERROR_XPC_CANT_CONVERT_WN_TO_FUN)). r/sr=mrbkap.) to fix orange.

dom/base/nsDOMClassInfo.cpp

@@ -5245,7 +5245,7 @@ public:
       ::JS_DefineUCProperty(cx, target,
                             reinterpret_cast<const jschar *>(mClassName),
                             nsCRT::strlen(mClassName), thisAsVal, nsnull,
-                            nsnull, 0);
+                            nsnull, JSPROP_PERMANENT);
 
     sDoSecurityCheckInAddProperty = doSecurityCheckInAddProperty;
     return ok ? NS_OK : NS_ERROR_UNEXPECTED;