Jonas Jenwald ee09336f32 Restore the URL.createObjectURL check to the createObjectURL utility function (issue 8344)
This is a regression from commit 3888a993b1.

It turns out the even though we have a `URL` polyfill, it's still dependent on the existence of native `URL.{createObjectURL, revokeObjectURL}` functions.
Since no such thing exists in Node.js, our `createObjectURL` utility function breaks there.
2017-04-27 20:57:15 +02:00
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