Updating trunk VERSION from 3590.0 to 3591.0

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

Change-Id: I0dcfcf2bf08021590984dedd56efe43c36e94625
Reviewed-on: https://chromium-review.googlesource.com/c/1297483Reviewed-by: chrome-release-bot@chromium.org <chrome-release-bot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#602239}

chrome/VERSION

 MAJOR=72
 MINOR=0
-BUILD=3590
+BUILD=3591
 PATCH=0