Crash http/tests/serviceworker/resolve-after-window-close.html

Test crashes sometimes, update expectations.

Tbr: findit@
No-try: true
No-presubmit: true
Bug: 946719
Change-Id: I83fe71181b9f4546f28332f1fd4e5fd3c491d7b3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1543369Reviewed-by: Noel Gordon <noel@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#645264}

third_party/blink/web_tests/TestExpectations

@@ -6126,3 +6126,4 @@ crbug.com/946624 virtual/user-activation-v2/http/tests/media/autoplay/document-u
 # Sheriff 2019-03-28
 crbug.com/946890 external/wpt/html/semantics/embedded-content/media-elements/location-of-the-media-resource/currentSrc.html [ Failure Pass ]
 crbug.com/946990 virtual/binary-for-devtools/http/tests/devtools/application-panel/storage-view-reports-quota.js [ Pass Timeout ]
+crbug.com/946719 http/tests/serviceworker/resolve-after-window-close.html [ Crash Pass ]