Updating trunk VERSION from 4177.0 to 4178.0

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

Change-Id: I9f6936661c5e7e1f2b5f932f7455c18c7f385a6b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2252742Reviewed-by: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#780146}

chrome/VERSION

 MAJOR=85
 MINOR=0
-BUILD=4177
+BUILD=4178
 PATCH=0