Fix prefetch_matches.cc formatting

Adding both owners to have a quick review to avoid any conflicts in the
file. Please autosubmit.

WANT_LGTM=any

Change-Id: Ib6b92fc665b5b91e9512bd3c20f31f9339a539fd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6479154
Auto-Submit: Sandor «Alex» Major <sandormajor@chromium.org>
Reviewed-by: Kenichi Ishibashi <bashi@chromium.org>
Commit-Queue: Kenichi Ishibashi <bashi@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1450844}