[ios] Fix deprecated usage API in CSSearchQuery.

Bug: None
Change-Id: I78480f0fe6bcecc3d7a04ec19fb4fca1c9fa9980
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5618751


Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com>
Reviewed-by: Mike Dougherty <michaeldo@chromium.org>
Commit-Queue: Mike Dougherty <michaeldo@chromium.org>
Commit-Queue: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1313189}