Remove default case for ShouldIgnoreProvider

Bug: b/259483439
Change-Id: I9f54a84d87784c13373499238eeed85dc4602633
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4060408


Reviewed-by: Rachel Wong <wrong@chromium.org>
Commit-Queue: Lauren Commeignes <laurencom@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1076504}