Disable flaky inspector-protocol/css/css-coverage-new-stylesheet.js.

inspector-protocol/css/css-coverage-new-stylesheet.js

TBR=einbinder@chromium.org
NOTRY=true

Bug: 901314
Change-Id: I67abd717378677fe42239831222ffd35b36b0dea
Reviewed-on: https://chromium-review.googlesource.com/c/1314529Reviewed-by: vitaliii <vitaliii@chromium.org>
Commit-Queue: vitaliii <vitaliii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604895}

third_party/WebKit/LayoutTests/TestExpectations

@@ -5520,3 +5520,6 @@ crbug.com/900730 [ Mac ] rootscroller/gesture-scroll-document-not-root-scroller.
 
 # ecosystem-infra sheriff 2018-11-02
 crbug.com/901271 external/wpt/dom/events/Event-dispatch-on-disabled-elements.html [ Pass Failure ]
+
+#Sheriff 2018-11-02
+crbug.com/901314 [ Win7 Mac10.10 Mac10.11 ] inspector-protocol/css/css-coverage-new-stylesheet.js [ Failure Pass ]