Updating trunk VERSION from 3279.0 to 3280.0

TBR=amineer@chromium.org

Change-Id: I59232b67fab1ac0ef1cd3a2851df5dfd093b37d7
Reviewed-on: https://chromium-review.googlesource.com/792277Reviewed-by: chrome-release-bot@chromium.org <chrome-release-bot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519558}

chrome/VERSION

 MAJOR=64
 MINOR=0
-BUILD=3279
+BUILD=3280
 PATCH=0