Incrementing VERSION to 73.0.3631.2

TBR=benmason@chromium.org

Change-Id: I3b63a2c8d1895ef6558f74b020f44d3150d8ff65
Reviewed-on: https://chromium-review.googlesource.com/c/1363431
Reviewed-by: chrome-release-bot@chromium.org <chrome-release-bot@chromium.org>
Cr-Commit-Position: refs/branch-heads/3631@{#3}
Cr-Branched-From: 95065abbd18c9be7661f8f64929ef17624090f64-refs/heads/master@{#613836}
1 file changed