[dom] Add tests for "inner invoke" with EventTarget in a detached iframe #34350
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This adds tests for dispatching events to an EventTarget created in an
iframe that gets detached --- both prior to and during event dispatch.
The behavior of engines for this case is to not run event listeners
after the EventTarget's associated global is detached, which is what we
check for in the tests.
Spec: https://dom.spec.whatwg.org/#concept-event-listener-inner-invoke
PR: whatwg/dom#1085
Bug: 1323391
Change-Id: I57aac7d444d3532ad0940a228452d206b5c1be07
Reviewed-on: https://chromium-review.googlesource.com/3691385
WPT-Export-Revision: 0e925d9e74f482b782ae8f6bcee3d62a6c560bd7