defunctorize DfindLibLwt
defunctorize DfindLibLwt

Summary: with the non-lwt DfindLib gone, this functor is unnecessary, so inlined it.

Reviewed By: nmote

Differential Revision: D22145894

fbshipit-source-id: f48486ee6ec3183fee7c4dd3b068c98b1630e0a1

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