Updating trunk VERSION from 4284.0 to 4285.0

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

Change-Id: Ic4374f32e11da55628b81d64e0ee34facbeb255d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2451730Reviewed-by: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#814067}

chrome/VERSION

 MAJOR=88
 MINOR=0
-BUILD=4284
+BUILD=4285
 PATCH=0