HTML/events/beforeunload - respect preventDefault(). #12221
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An existing web-platform-test was enhanced to make sure
the preventDefault only (or combined) cases work.
Added many layout tests (due to the lack of
web-platform-tests APIs for handling beforeunload alert)
for most of the intricacies of beforeunload.
Bug: 866818
Change-Id: I35c27cee1f71a4e4d10331d3451e0a36b9db684d
Reviewed-on: https://chromium-review.googlesource.com/1154225
WPT-Export-Revision: 2c4d10c3435bc0d493b3dbe0de42d7f41f8da0e8