[iOS] Don't use title case on iOS

iOS moved to sentence case for its strings.
Update the tests to make sure they pass with the new strings.

Bug: 373823958
Change-Id: I9b32cd279a022558d40800a5c459da5169145354
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6017925
Auto-Submit: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1383662}