[Sheriff] Mark webexposed/global-interface-listing-shared-worker.html as Slow

TBR=sebsg@chromium.org

Bug: 910627
Change-Id: I917d2e07713da009e615f8796b9ffaaed7540111
Reviewed-on: https://chromium-review.googlesource.com/c/1357081Reviewed-by: Hiroshige Hayashizaki <hiroshige@chromium.org>
Commit-Queue: Hiroshige Hayashizaki <hiroshige@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612733}

third_party/blink/web_tests/SlowTests

@@ -388,6 +388,8 @@ crbug.com/865262 [ Mac ] media/controls/text-track-menu-pointer-selection.html [
 crbug.com/865262 [ Mac ] virtual/new-remote-playback-pipeline/media/controls/text-track-menu-pointer-selection.html [ Slow ]
 crbug.com/876050 [ Mac ] virtual/video-surface-layer/media/controls/text-track-menu-pointer-selection.html [ Slow ]
 
+crbug.com/910627 webexposed/global-interface-listing-shared-worker.html [ Slow ]
+
 ### virtual/gpu/fast/canvas/ blending layout tests are slow
 crbug.com/866850 [ Linux ] virtual/gpu/fast/canvas/canvas-blend-image.html [ Slow ]
 crbug.com/866850 [ Mac ] virtual/gpu/fast/canvas/canvas-blend-image.html [ Slow ]