Revert changes to _tags
Revert changes to _tags

Reviewed By: samwgoldman

Differential Revision: D18510942

fbshipit-source-id: a0f0d3a779ca63ce8d60e1cc08e054a79da2d92c

samwgoldman/flow,samwgoldman/flow,mroch/flow,samwgoldman/flow,mroch/flow,samwgoldman/flow,mroch/flow,facebook/flow,facebook/flow,facebook/flow,mroch/flow,mroch/flow,samwgoldman/flow,facebook/flow,samwgoldman/flow,mroch/flow,facebook/flow,facebook/flow,facebook/flow,samwgoldman/flow,mroch/flow