Updating trunk VERSION from 3355.0 to 3356.0

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

Change-Id: Ic358c554bc5e658991fcece5c03f497c36ca0184
Reviewed-on: https://chromium-review.googlesource.com/936609Reviewed-by: chrome-release-bot@chromium.org <chrome-release-bot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#539030}

chrome/VERSION

 MAJOR=66
 MINOR=0
-BUILD=3355
+BUILD=3356
 PATCH=0