Updating trunk VERSION from 4072.0 to 4073.0

# This is an automated release commit.
# Do not revert without consulting chrome-pmo@google.com.
NOAUTOREVERT=true
TBR=abdulsyed@chromium.org

Change-Id: I7f5bfd80accfdf96073f2a13693248521433bab8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2078741Reviewed-by: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#745358}

chrome/VERSION

 MAJOR=82
 MINOR=0
-BUILD=4072
+BUILD=4073
 PATCH=0