Nothing, it's just that the field is required for the function that's being used for the obfuscation. There's a lot of confused people in this thread. There are no mistakes made in the code, people are simply surprised that there's a mode in which Chromium that only obfuscates the keystore. Adding to the confusion is the fact that they're using an encryption library to do the obfuscation, so people see it and expect there to be real encryption going on and then see the dummy values in the important fields.