Revert "Revert "Complete [add|remove]OnSessionTokensChangedListener""

This reverts commit 73b80b064ee813474e03b7bdb1e7aff4289ec06b.

Bug: 73226650
Test: runtest-MediaComponents
Change-Id: Ibed89af52a1d759cec56a53284651dfdb5e26d91
1 file changed