bors-servo e891277dd5 Auto merge of #14994 - jdm:callback_rooting, r=Manishearth,Ms2ger ...

Make WebIDL callbacks permanently rooted

This replicates the same model that Promise uses right now, because it requires less thinking than coming up with something else.

- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix #14447
- [ ] There are tests for these changes

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2017-01-16 10:16:44 -08:00

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