Remove stale test expectation - the bug has been fixed already.

https://crbug.com/886588 has been fixed and
external/wpt/dom/events/EventListener-addEventListener.sub.window.js
is passing now with and without site-per-process - there is no need for
this test expectation anymore.

Bug: 886588
Change-Id: I8a9a30f0202cdd623dae5d506c1cb7c86eafb519
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1515592
Commit-Queue: Ɓukasz Anforowicz <lukasza@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#639946}
2 files changed