This should unblock the fuzzers for now, though it's not the ideal solution.
It's the only reasonably easy solution to unblock them though, I think.
We should probably always keep track of the document a stylesheet was associated
with. We'll need that for constructible stylesheets anyway.
That requires some though on how to get the cycle-collection and such right,
though, and I wouldn't be able to write or land that ASAP.
Differential Revision: https://phabricator.services.mozilla.com/D23584
--HG--
extra : moz-landing-system : lando
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