also happens on MacOSX 10.11
https://uberchromegw.corp.google.com/i/chromium.webkit/builders/WebKit%20Mac10.11%20%28dbg%29/builds/10473

styles-add-new-rule-tab.js fails on Win Dbg consistently https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Win7%20%28dbg%29/builds/11762

The diff is
--- e:\b\s\w\ioh6owi6\layout-test-results\retry_1\virtual/mojo-loading/http/tests/devtools/elements/styles-3/styles-add-new-rule-tab-expected.txt
+++ e:\b\s\w\ioh6owi6\layout-test-results\retry_1\virtual/mojo-loading/http/tests/devtools/elements/styles-3/styles-add-new-rule-tab-actual.txt
@@ -7,7 +7,6 @@
 
 [expanded] 
 foo, [$div#inspected, $]bar { (inspector-stylesheet:1 -> inspector-stylesheet:1:26)
-    color: maroon;
 
 [expanded] 
 [$div$] { (user agent stylesheet)

That is "color: maroon;" is missing. Looks like a bug.

The same about http/tests/devtools/elements/styles-3/styles-add-new-rule.js
"color: maroon;" is missing.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/d991b11eb365321e190ed016e041fe5ef9a2c02a

commit d991b11eb365321e190ed016e041fe5ef9a2c02a
Author: Vasilii Sukhanov <vasilii@chromium.org>
Date: Thu Oct 26 12:50:32 2017

Update expectations for devtools/elements/styles-3 tests

virtual/mojo-loading/http/tests/devtools/elements/styles-3/styles-add-new-rule-tab.js and http/tests/devtools/elements/styles-3/styles-add-new-rule.js fail on Win Dbg.

TBR=chenwilliam@chromium.org

Bug:  778515 
Change-Id: I6ac3bccd6f465dedaacb55ffcc8452d966d3ded7
Reviewed-on: https://chromium-review.googlesource.com/738246
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#511798}
[modify] https://crrev.com/d991b11eb365321e190ed016e041fe5ef9a2c02a/third_party/WebKit/LayoutTests/TestExpectations

I think this is still failing:
https://uberchromegw.corp.google.com/i/chromium.webkit/builders/WebKit%20Mac10.11%20%28dbg%29

The 3 failing tests mentioned in #1 are no longer failing. Removing sheriff label.