[automerger skipped] Support setting the default interface to null again. am: 876e5e16a9 -s ours am: 6fb426f10a -s ours am: f7bc865d2c -s ours
am skip reason: Change-Id I5109d8da3aeb6c1f6523291d9e2ec92c64b5ad2d with SHA-1 e81f99d532 is in history
Change-Id: I9cea9b849fff6b292d81b6bd2a1c8338d3d271a1
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