Incrementing VERSION to 80.0.3987.28

TBR=mmoss@chromium.org

Change-Id: I981092e162d88985461f2ff9dd6c0daee1653681
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1980470
Reviewed-by: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/branch-heads/3987@{#357}
Cr-Branched-From: c4e8da9871cc266be74481e212f3a5252972509d-refs/heads/master@{#722274}
1 file changed