Update for the actor table change
Update for the actor table change

Core change I8d825eb0 begins the process of changing core database
tables from using xx_user and xx_user_text fields to using xx_actor.
This updates the extension to continue to function during and after the
transition.

Bug: T167246
Change-Id: Ib84a5a7a9f80fa321f7482d4c27c5f58add47230

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