Incrementing VERSION to 73.0.3683.18

TBR=abdulsyed@chromiue.org

Change-Id: I1b6ea0770eff387cea2137f324ed9f20cb6bf25c
Reviewed-on: https://chromium-review.googlesource.com/c/1450869
Reviewed-by: chrome-release-bot@chromium.org <chrome-release-bot@chromium.org>
Cr-Commit-Position: refs/branch-heads/3683@{#152}
Cr-Branched-From: e51029943e0a38dd794b73caaf6373d5496ae783-refs/heads/master@{#625896}
1 file changed