The prefixless version should always be last, so that the older
prefixed implementation (if different) doesn’t win out in the cascade.
Especially now other browsers (Edge) support the webkit version as well.
Removed -o- as that was only used by Opera 11.5, which hasn’t been the
current version since I worked there. Presto users were quickly
auto-updated to Opera 12, and now Opera uses Blink.
