Silence "switch statement contains default but no case labels"; NFC (#198866)

65f8a7c1c423d96597bdb14062a0d0eb27d7caf4 accidentally introduced some
diagnostics from having a switch statement with a default label but no
case labels. This removes the switch statements until we have more cases
to add.

GitOrigin-RevId: 58996c1de12b231af45aefbe5fe2e20a796c5d35