Enable resolve-after-window-close.html

The fix (crrev.com/c/2078521) seems to be working. Enable the test.

Bug: 946719
Change-Id: Idc66d61775eabb5867df6a00eb3998547fe9cdb7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2091096Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Commit-Queue: Kenichi Ishibashi <bashi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747600}

third_party/blink/web_tests/TestExpectations

@@ -5704,7 +5704,6 @@ crbug.com/835943 [ Release ] http/tests/appcache/non-html.xhtml [ Crash Pass Fai
 
 # Sheriff 2019-03-28
 crbug.com/946890 external/wpt/html/semantics/embedded-content/media-elements/location-of-the-media-resource/currentSrc.html [ Failure Pass Crash ]
-crbug.com/946719 http/tests/serviceworker/resolve-after-window-close.html [ Crash Pass ]
 crbug.com/946714 [ Release ] http/tests/devtools/elements/styles-4/styles-live-locations-leak.js [ Pass Timeout ]
 crbug.com/946699 [ Release ] http/tests/devtools/network/network-filter-service-worker.js [ Pass Timeout ]
 crbug.com/946711 [ Release ] http/tests/devtools/editor/text-editor-search-switch-editor.js [ Crash Pass Timeout ]