[automerger skipped] Support setting the default interface to null again. am: 876e5e16a9 am: 65c1bc7c5d am: ac350dddc6 am: 4d5310692c -s ours
am skip reason: Change-Id I5109d8da3aeb6c1f6523291d9e2ec92c64b5ad2d with SHA-1 876e5e16a9 is in history
Change-Id: I7f7417ccca7c9cfac332954a6f6dea5a58a54239
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