bors-servo e580250d5d Auto merge of #21988 - CYBAI:drop-promises, r=jdm ...

Clear refcounted promise before dropping JSRuntime

Not sure if this is the right solution?

I also tried to `impl Drop for LiveDOMReferences` but it's still executed after dropping JSRuntime.
So, maybe we should clear it before dropping the JSRuntime?

cc @jdm @asajeffrey

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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #21331 .
- [x] There are tests for these changes; the status of `fetch/cross-origin-resource-policy/fetch-in-iframe.html` will be `OK`

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2018-10-29 08:31:12 -04:00

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