Inline CheckDestinationRateLimit

Change-Id: I15bd61ffd453e64b594652312fad25432be096c2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5426735


Reviewed-by: Andrew Paseltiner <apaseltiner@chromium.org>
Commit-Queue: Nan Lin <linnan@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1282725}