DO NOT MERGE: Add a null check for the OnStartTetheringCallback.
am: c8e4cc8e99 -s ours
Change-Id: I3290e0f17c8d29f7e7216687f85b7487a3b85ac5
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am: c8e4cc8e99 -s ours
Change-Id: I3290e0f17c8d29f7e7216687f85b7487a3b85ac5