Gardening: NetworkService: fetch-canvas-tainting-video-cache.https.html fails

This is a new test failing on NetworkService.

TBR=shimazu
NOTRY=true

Bug: 807271
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
Change-Id: Ibd72f25ad253a5d4231d3082b84d717eddde63e3
Reviewed-on: https://chromium-review.googlesource.com/893242Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Commit-Queue: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532855}

third_party/WebKit/LayoutTests/FlagExpectations/enable-features=NetworkService

@@ -25,6 +25,7 @@ Bug(none) external/wpt/service-workers/service-worker/claim-shared-worker-fetch.
 Bug(none) external/wpt/service-workers/service-worker/client-navigate.https.html [ Pass Crash Failure ]
 Bug(none) external/wpt/service-workers/service-worker/clients-get-client-types.https.html [ Failure ]
 Bug(none) external/wpt/service-workers/service-worker/clients-get.https.html [ Failure ]
+crbug.com/807271 external/wpt/service-workers/service-worker/fetch-canvas-tainting-video-cache.https.html [ Failure ]
 Bug(none) external/wpt/service-workers/service-worker/fetch-event-respond-with-response-body-with-invalid-chunk.https.html [ Failure ]
 Bug(none) external/wpt/service-workers/service-worker/fetch-frame-resource.https.html [ Pass Failure ]
 Bug(none) external/wpt/service-workers/service-worker/fetch-header-visibility.https.html [ Pass Failure Crash ]