[automerger skipped] Support setting the default interface to null again. am: 876e5e16a9 am: 65c1bc7c5d -s ours
am skip reason: Change-Id I5109d8da3aeb6c1f6523291d9e2ec92c64b5ad2d with SHA-1 876e5e16a9 is in history
Change-Id: Ie8adbc5239fdf8343a9b0e4cd30eddc28e96caaa
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