[automerger skipped] Send tethered interface callbacks based on interface existence. am: 0c30d949df -s ours
am skip reason: Change-Id I015219cbd03626c38fb5156d0cb2991ba7d7def7 with SHA-1 165b456d92 is in history
Change-Id: I798052af6ff6704c9088c3e0f2952b1ccc41d94b
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