history.go(-1) in an iframe doesn't appear to be firing onunload in WPT html/browsers/browsing-the-web/navigating-across-documents/003.html and /004.html

[pshaughn]

This test is broken up into different iframe pages so they can interact with history. 003-2.html posts a message that the parent document sees, then tries to go back in history. Its unload handler sets location = "003-3.html", but the parent never gets a message from 003-3.html. The obvious explanation is that the unload isn't firing, but of course the test has enough moving parts that there could be another explanation.

[pshaughn]

004.html differs from 003.html slightly but the same net result happens.