Updating trunk VERSION from 4230.0 to 4231.0

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

Change-Id: I3f90455a47371ea4114c9dcd4b1eb396d3c86249
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2348017Reviewed-by: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#796686}

chrome/VERSION

 MAJOR=86
 MINOR=0
-BUILD=4230
+BUILD=4231
 PATCH=0