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Code cleanup: crOS Account Manager tests

Cleanup all usages of test fixture member access from tests. They should
go through member methods instead of being accessed directly.

Change-Id: I7b8730d470ae051a2ca4e4b9768fc16ac84179ac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2255079
Commit-Queue: Kush Sinha <sinhak@chromium.org>
Reviewed-by: Anastasiia N <anastasiian@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781390}