[automerger skipped] Support setting the default interface to null again. am: 876e5e16a9 am: 65c1bc7c5d -s ours am: 4c80e73bfa -s ours am: 7f312a0274 -s ours
am skip reason: Change-Id I5109d8da3aeb6c1f6523291d9e2ec92c64b5ad2d with SHA-1 876e5e16a9 is in history
Change-Id: If9d19fa5ad7ea5a49c5c0fc8d2fb53ef90283d7b
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