Updating trunk VERSION from 4154.0 to 4155.0

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

Change-Id: If0eed183b584b5dd246de126a3a392ebffbe884b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2213851Reviewed-by: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#771410}

chrome/VERSION

 MAJOR=85
 MINOR=0
-BUILD=4154
+BUILD=4155
 PATCH=0