Back out "[Thrift][cpp2] Destroy request inline when already on EventBase"
Back out "[Thrift][cpp2] Destroy request inline when already on EventBase"

Summary: Original commit changeset: 5ed03dc83f15

Reviewed By: yfeldblum

Differential Revision: D15214372

fbshipit-source-id: 51c6346513e46f83b451821fc45f583f16406aa9

facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift