Revert "Update to Mockito v2.25.7."

This reverts commit feedf5422d04e9d37a8f7c8e76d17f2cf7378924.

Reason for revert: b/138648173

Change-Id: I21b2147346f42bb35ef263f333ff08f1b1216ae3
Exempt-From-Owner-Approval: fix tot
178 files changed