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24a1e4a8e1
This test currently assume that cloning a COW will fail. Once we always go over security wrappers, this isn't true anymore, because COWs silently deny disallowed property gets. So it makes sense to rewrite the test so that we can see what actually makes it through the structured clones. Promises galore. We also take out the buggy Blob/FileList stuff and replace it with ImageData, which does a bonafide clone in NS_DOMWriteStructuredClone instead of the weird pointer swapping we do in nsGlobalWindow.cpp (baku is in the process of cleaning that up, but it's not done yet).