Updating trunk VERSION from 3350.0 to 3351.0

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

Change-Id: I30f5818ba05186b917e88c64fe7f21ff7255a12a
Reviewed-on: https://chromium-review.googlesource.com/924088Reviewed-by: chrome-release-bot@chromium.org <chrome-release-bot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537364}

chrome/VERSION

 MAJOR=66
 MINOR=0
-BUILD=3350
+BUILD=3351
 PATCH=0