Updating trunk VERSION from 3969.0 to 3970.0

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

Change-Id: I580209d435528a0d887ee66b717bce656d860c7d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1918954Reviewed-by: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#716000}

chrome/VERSION

 MAJOR=80
 MINOR=0
-BUILD=3969
+BUILD=3970
 PATCH=0