After change https://chromium-review.googlesource.com/514443, the Win10 builder started failing these tests:

 http/tests/inspector/extensions/extensions-panel.html
 virtual/mojo-loading/http/tests/inspector/extensions/extensions-panel.html
 virtual/mojo-loading/http/tests/security/subresourceIntegrity/shared-with-xhtml.html

Build: https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Win10/builds/24064

Results: https://storage.googleapis.com/chromium-layout-test-archives/WebKit_Win10/24064/layout-test-results/results.html

This likely indicates that something about the configuration of the try bots and continuous bots is different; first step is to confirm whether this is the case, and investigate specifically what is different.