Updating trunk VERSION from 3560.0 to 3561.0

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

Change-Id: Ibc83b79270a95040405b7ff1a5bd0628fe287068
Reviewed-on: https://chromium-review.googlesource.com/1240170Reviewed-by: chrome-release-bot@chromium.org <chrome-release-bot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593567}

chrome/VERSION

 MAJOR=71
 MINOR=0
-BUILD=3560
+BUILD=3561
 PATCH=0