Updating trunk VERSION from 4199.0 to 4200.0

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

Change-Id: Id353e8966d2eddba95735373cec0e6941426bba6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2293168Reviewed-by: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#787482}

chrome/VERSION

 MAJOR=86
 MINOR=0
-BUILD=4199
+BUILD=4200
 PATCH=0