Updating trunk VERSION from 4342.0 to 4343.0

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

Change-Id: I2602e3b6e48939be6dac0001eedbaad02b8b432a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2566719Reviewed-by: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#832200}

chrome/VERSION

 MAJOR=89
 MINOR=0
-BUILD=4342
+BUILD=4343
 PATCH=0