Sheriff: Mark http/tests/devtools/elements/styles-1/disable-property-workingcopy-update.js

This test consistently results in Timeout/Pass on Win/Mac/Linux bots.

Bug: 1040270
Change-Id: I0759ee1f83b002465fcd6c19aaeef7e25ea8ecda
Tbr: nhiroki@chromium.org
Notry: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1990890Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#729614}

third_party/blink/web_tests/TestExpectations

@@ -7327,3 +7327,6 @@ crbug.com/1039401 [ Linux ] virtual/text-antialias/textIteratorNilRenderer.html
 crbug.com/1039401 [ Linux ] virtual/web-components-v0-disabled/fast/dom/HTMLMeterElement/meter-boundary-values.html [ Failure ]
 crbug.com/1039401 [ Linux ] virtual/web-components-v0-disabled/fast/dom/HTMLMeterElement/meter-optimums.html [ Failure ]
 crbug.com/1039401 [ Linux ] virtual/web-components-v0-disabled/fast/dom/HTMLMeterElement/meter-styles.html [ Failure ]
+
+# Sheriff 2020-01-09
+crbug.com/1040270 http/tests/devtools/elements/styles-1/disable-property-workingcopy-update.js [ Pass Timeout ]