Oli Lan b03365182c Update nullability of extension versions in Rollback.
This updates nullability annotations in Rollback and RollbackStore as
suggested in comments on ag/11256434.

Bug: 152737927
Test: atest RollbackUnitTest
Test: atest RollbackTest
Test: atest RollbackStoreTest
Change-Id: Ib0973378fdd24ce275b0f3e1a687f9161d3c0e7d
2020-04-29 11:20:21 +01:00
2020-04-28 14:14:30 +00:00
2020-04-27 11:53:12 -06:00
2020-04-28 22:43:28 -07:00
Description
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21 GiB
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