Mark worklet-animation-with-scroll-timeline-and-display-none.https.html flaky

See dashboard:
https://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType=webkit_layout_tests&tests=worklet-animation-with-scroll-timeline-and-display-none

TBR=treib@chromium.org
NOTRY=true

Bug: 915352
Change-Id: Ie287d2af0cd7fff9e2393e2918837867dcf4125d
Reviewed-on: https://chromium-review.googlesource.com/c/1496762Reviewed-by: Yi Gu <yigu@chromium.org>
Commit-Queue: Yi Gu <yigu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636798}

third_party/blink/web_tests/TestExpectations

@@ -3012,8 +3012,6 @@ crbug.com/893480 external/wpt/infrastructure/testdriver/actions/multiDevice.html
 crbug.com/918664 external/wpt/css/vendor-imports/mozilla/mozilla-central-reftests/sizing/block-size-with-min-or-max-content-table-1a.html [ Failure Pass ]
 
 # ====== New tests from wpt-importer added here ======
-crbug.com/626703 [ Mac10.10 ] virtual/threaded/external/wpt/animation-worklet/worklet-animation-with-scroll-timeline-and-display-none.https.html [ Failure ]
-crbug.com/626703 [ Mac10.10 ] virtual/threaded/external/wpt/animation-worklet/worklet-animation-with-scroll-timeline.https.html [ Failure ]
 crbug.com/626703 virtual/webrtc-wpt-plan-b/external/wpt/webrtc/RTCPeerConnection-setRemoteDescription-tracks.https.html [ Timeout ]
 crbug.com/626703 external/wpt/webrtc/RTCPeerConnection-setRemoteDescription-tracks.https.html [ Timeout ]
 crbug.com/626703 external/wpt/webrtc/RTCPeerConnection-remote-track-mute.https.html [ Timeout ]
@@ -5959,7 +5957,7 @@ crbug.com/915352 virtual/threaded/external/wpt/animation-worklet/worklet-animati
 crbug.com/915352 virtual/threaded/external/wpt/animation-worklet/worklet-animation-with-fill-mode.https.html [ Pass Failure ]
 
 crbug.com/915352 [ Mac10.11 ] virtual/threaded/external/wpt/animation-worklet/worklet-animation-with-scroll-timeline.https.html [ Failure ]
-crbug.com/915352 [ Mac10.11 ] virtual/threaded/external/wpt/animation-worklet/worklet-animation-with-scroll-timeline-and-display-none.https.html [ Failure ]
+crbug.com/915352 [ Mac10.10 Mac10.11 ] virtual/threaded/external/wpt/animation-worklet/worklet-animation-with-scroll-timeline-and-display-none.https.html [ Pass Failure ]
 
 # Sheriff 2019-03-01
 crbug.com/937215 [ Linux ] media/controls/modern/doubletap-to-jump-forwards.html [ Pass Failure ]