Updating trunk VERSION from 3968.0 to 3969.0

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

Change-Id: I077255774e5546948b71d8575e5f06630eaec675
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1918684
Reviewed-by: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#715591}

chrome/VERSION

@@ -1,4 +1,4 @@
 MAJOR=80
 MINOR=0
-BUILD=3968
+BUILD=3969
 PATCH=0