Fix enrollment cancelation race conditions.

Bug: 210090299

Change-Id: Idd1485f182cf841b96ced1dab4b8330ff3b57c2a
Merged-In: Idd1485f182cf841b96ced1dab4b8330ff3b57c2a
(cherry picked from commit abc127673bf8f030cfb92d2f94d8f14baf9cd2aa)
Merged-In:Idd1485f182cf841b96ced1dab4b8330ff3b57c2a
30 files changed