fix lint errors.
fix lint errors.

derekjchow/models,derekjchow/models,derekjchow/models,tombstone/models,derekjchow/models,alexgorban/models,tombstone/models,tombstone/models,alexgorban/models,alexgorban/models,derekjchow/models,tombstone/models,tombstone/models,alexgorban/models,alexgorban/models,tombstone/models