Updating trunk VERSION from 3338.0 to 3339.0

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

Change-Id: I8f16904f331848466d4fcfef6d2680f829120970
Reviewed-on: https://chromium-review.googlesource.com/900225Reviewed-by: chrome-release-bot@chromium.org <chrome-release-bot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534255}

chrome/VERSION

 MAJOR=66
 MINOR=0
-BUILD=3338
+BUILD=3339
 PATCH=0