chore: remove unused proto imports (#391)

- [ ] Regenerate this pull request now.

PiperOrigin-RevId: 468735472

Source-Link: https://github.com/googleapis/googleapis/commit/cfa1b3782da7ccae31673d45401a0b79d2d4a84b

Source-Link: https://github.com/googleapis/googleapis-gen/commit/09b7666656510f5b00b893f003a0ba5766f9e250
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gcf-owl-bot[bot] committed 4y ago

786a6c3ca215b4471a9610adbe2f7075deb37d88

Parent: 51c6db0

Committed by GitHub <noreply@github.com> on 8/19/2022, 8:22:15 PM