Updating trunk VERSION from 3480.0 to 3481.0

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

Change-Id: I58b05780e046fcda2cf44ee54c85fdfce6422989
Reviewed-on: https://chromium-review.googlesource.com/1123922Reviewed-by: chrome-release-bot@chromium.org <chrome-release-bot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572094}

chrome/VERSION

 MAJOR=69
 MINOR=0
-BUILD=3480
+BUILD=3481
 PATCH=0