A host's logout step: ReleaseUserRecordingShards for the provider's signed-in user, with the
browser's IndexedDB store and the provider's recording transport. Call it while the provider is
still authenticated (before its token is dropped). Never rejects.
A host's logout step: ReleaseUserRecordingShards for the provider's signed-in user, with the browser's IndexedDB store and the provider's recording transport. Call it while the provider is still authenticated (before its token is dropped). Never rejects.