Updating trunk VERSION from 3427.0 to 3428.0

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

Change-Id: I42b52ed7b128fa4ab7fcced81b32804e7438d5ed
Reviewed-on: https://chromium-review.googlesource.com/1054049Reviewed-by: chrome-release-bot@chromium.org <chrome-release-bot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557779}

chrome/VERSION

 MAJOR=68
 MINOR=0
-BUILD=3427
+BUILD=3428
 PATCH=0