Updating trunk VERSION from 4293.0 to 4294.0

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

Change-Id: Icff6af0ec282776916945b8a5f87d50c99c083f0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2473366Reviewed-by: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#817351}

chrome/VERSION

 MAJOR=88
 MINOR=0
-BUILD=4293
+BUILD=4294
 PATCH=0