Summary:
Refactor a code block that is duplicated 2x. Logic stays the same besides renaming, and a ternary operator to decide between getting the children from "old" or "new" tree.
Tests can help us refactor knowing that the logic is still correct.
Changelog: [Internal]
Reviewed By: sammy-SC
Differential Revision: D28018994
fbshipit-source-id: d34a033444e67091e44ff6a747fd39846c165238