Updating trunk VERSION from 3389.0 to 3390.0

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

Change-Id: Ie4c4e791eb4e4fd74f234f147c0942d092e2a851
Reviewed-on: https://chromium-review.googlesource.com/996854Reviewed-by: chrome-release-bot@chromium.org <chrome-release-bot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548303}

chrome/VERSION

 MAJOR=67
 MINOR=0
-BUILD=3389
+BUILD=3390
 PATCH=0