Bug 845341 - Make sure that PrivateBrowsingUtils.permanentPrivateBrowsing does not throw if the autostart pref doesn't have a default value; r=jdm a=bajaj

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extra : transplant_source : TJ%D0%97%D8%3A%FAB%A1O%10%BF%DA%FE%5E%DF%3F%96%A9%B2