Inline `IncrementProjectCount`, which was simplified earlier to a 1-liner.

This addresses a comment in https://crrev.com/c/7038839, which I earlier
missed.

Change-Id: I21d101bd322faf3bed280fb80d7b18204bc81bcc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7046120
Reviewed-by: Caitlin Fischer <caitlinfischer@google.com>
Commit-Queue: Jeffrey Yu <yuje@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1530902}
NOKEYCHECK=True
GitOrigin-RevId: 8284a071c45accd5ba457b6ee07a54ed3ee322bc