inspector-protocol/css/css-coverage-new-stylesheet.js is flaky on site_per_process_webkit_layout_tests and webkit_layout_tests. 

https://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType=site_per_process_webkit_layout_tests&tests=css-coverage-new-stylesheet

https://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType=webkit_layout_tests&tests=css-coverage-new-stylesheet

examples:
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Linux%20Tests/73095
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Linux%20Tests/73109

There was a recent change that might be related: 
https://chromium-review.googlesource.com/c/chromium/src/+/1279293

It started to be flaky on Win10 as well. ATM I'll just disable it on Win10. Please take a look at this issue. Thanks!

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/601221d4556574975b2979ce97e6977ac1d57c8a

commit 601221d4556574975b2979ce97e6977ac1d57c8a
Author: Yi Gu <yigu@chromium.org>
Date: Mon Oct 22 21:03:46 2018

Mark css-coverage-new-stylesheet flaky on Win10

TBR=einbinder@chromium.org
NOTRY=true

Bug:  897075 
Change-Id: I0d844c234e40658a58974e1ecfe0a0d933a9e663
Reviewed-on: https://chromium-review.googlesource.com/c/1294696
Commit-Queue: Yi Gu <yigu@chromium.org>
Reviewed-by: Yi Gu <yigu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601722}
[modify] https://crrev.com/601221d4556574975b2979ce97e6977ac1d57c8a/third_party/WebKit/LayoutTests/TestExpectations