Updating trunk VERSION from 3788.0 to 3789.0

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

Change-Id: Ia09502ebaca1bbdeda116acf4ac76db247a93c25
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1600389Reviewed-by: chrome-release-bot@chromium.org <chrome-release-bot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#657607}

chrome/VERSION

 MAJOR=76
 MINOR=0
-BUILD=3788
+BUILD=3789
 PATCH=0