Updating trunk VERSION from 3630.0 to 3631.0

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

Change-Id: I2b8882439da8fcc5c09d4f5e91d93361212adffe
Reviewed-on: https://chromium-review.googlesource.com/c/1359978Reviewed-by: chrome-release-bot@chromium.org <chrome-release-bot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613413}

chrome/VERSION

 MAJOR=73
 MINOR=0
-BUILD=3630
+BUILD=3631
 PATCH=0