remove unnecessary & deprecated activate() call
remove unnecessary & deprecated activate() call

Summary: let's not do this to ourselves :)

Test Plan: unit

Reviewed By: yfeldblum@fb.com

Subscribers: folly-diffs@, jsedgwick, yfeldblum, chalfant

FB internal diff: D1993491

Signature: t1:1993491:1429063112:b8664b365ad12fa4b51e9bd7fde9e4d197dbc648

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