Hello all,
Now that we no longer have xbl implements="" to worry about, I have
landed patches to remove the QueryInterface method from Element
instances [1] and the infrastructure for exposing QueryInterface on Web
IDL objects in general [2]. There may still be cases in which custom
element implementations implement QueryInterface on elements, but that's
handled entirely on the JS side, without involving C++ code in any way.
I checked that there are no calls to the C++ QueryInterface anywhere in
our tests and did some basic code-searching to make sure I didn't find
any, but there might in theory be issues with codepaths which are not
tested in automation...
-Boris
[1] https://bugzilla.mozilla.org/show_bug.cgi?id=1568883
[2] https://bugzilla.mozilla.org/show_bug.cgi?id=1568249
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