Updating trunk VERSION from 4388.0 to 4389.0

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

Change-Id: I8057dbe4cf6afff55b7f92cdf3bcb99dfad31380
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2628000Reviewed-by: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#843379}

chrome/VERSION

 MAJOR=89
 MINOR=0
-BUILD=4388
+BUILD=4389
 PATCH=0