Updating trunk VERSION from 3856.0 to 3857.0

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

Change-Id: I0161bcd469d04a0ec2fe5c412c8ef58664540b68
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1707835Reviewed-by: chrome-release-bot@chromium.org <chrome-release-bot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#678564}

chrome/VERSION

 MAJOR=77
 MINOR=0
-BUILD=3856
+BUILD=3857
 PATCH=0