Updating trunk VERSION from 4218.0 to 4219.0

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

Change-Id: I283310c7c98d4f85d5cc9cd2b281520e17a90a29
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2331075Reviewed-by: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#793496}

chrome/VERSION

 MAJOR=86
 MINOR=0
-BUILD=4218
+BUILD=4219
 PATCH=0