Fix a race in Observer.SubscribeCallback test
Reviewed By: yfeldblum Differential Revision: D15929165 fbshipit-source-id: 476dd6a69d232642437ac65f0519db5acc3a0608
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Reviewed By: yfeldblum Differential Revision: D15929165 fbshipit-source-id: 476dd6a69d232642437ac65f0519db5acc3a0608