[Sheriff] Mark stylesheet-tracking.js as failing

TBR=petermarshall

Bug: 1046784
Change-Id: I53b500ac0a602fc509bac5a1f49a061ded4ee876
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2218268Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772235}

third_party/blink/web_tests/TestExpectations

@@ -5605,7 +5605,6 @@ crbug.com/1046784 http/tests/devtools/bindings/navigator-frame-attach-detach.js
 crbug.com/1046784 http/tests/devtools/forced-layout-in-microtask.js [ Pass Timeout ]
 crbug.com/1046784 http/tests/devtools/application-panel/resources-panel-iframe-idb.js [ Pass Timeout ]
 crbug.com/1046784 http/tests/devtools/a11y-axe-core/sources/scope-pane-a11y-test.js [ Pass Timeout ]
-crbug.com/1046784 http/tests/devtools/elements/styles/stylesheet-tracking.js [ Pass Timeout ]
 
 # Sheriff 2020-01-28
 crbug.com/1046201 [ Mac ] fast/forms/calendar-picker/calendar-picker-appearance-zoom125.html [ Pass Failure ]
@@ -5891,3 +5890,4 @@ crbug.com/1086353 [ Win ] http/tests/websocket/close-in-order.html [ Pass Failur
 
 # Sheriff 2020-05-27
 crbug.com/1083585 [ Win7 ] geolocation-api/watchPosition-page-visibility.html [ Pass Failure ]
+crbug.com/1046784 http/tests/devtools/elements/styles/stylesheet-tracking.js [ Pass Failure Timeout ]