Fix CSP exceptions for googlestorage in garden-o-matic.

TBR=ojan@chromium.org, abarth@chromium.org
BUG=261719

Review URL: https://codereview.chromium.org/23781004

git-svn-id: svn://svn.chromium.org/blink/trunk@157258 bbb929c8-8fbe-4397-9dbb-9b2b20218538