Similar to NotificationsTest.TestOriginPrefsNotSavedInIncognito[1] interactive ui test, we should have a test which runs on Android that confirms that notification permission autoblocks from incognito browsing do not get persisted on Android either.

We do already have SiteChannelsManagerTest#testBlockingPermissionInIncognitoCreatesNoChannels [2] to check we don't persist settings into the system UI, but this is only relevant to Android O+.

[1] https://cs.chromium.org/chromium/src/chrome/browser/notifications/notification_interactive_uitest.cc?l=365 - note this is currently disabled, see  Issue 841203  for getting it running again)