Revert "Modify Tests to make SessionManager final for tests"

Revert submission 30239784-spec_session_fix

Reason for revert: Droidmonitor created revert due to b/377750579. Will be verifying through ABTD before submission.

Reverted changes: /q/submissionid:30239784-spec_session_fix

Change-Id: I1c09cc79093365e4e3b4e3039ca40561c6637a03
2 files changed