[chromium] Layout Test fast/frames/sandboxed-iframe-navigation-windowopen.html is slow

[Andrey Kosyakov]

fast/frames/sandboxed-iframe-navigation-windowopen.html slowed down considerably on all platforms/configurations after r99138
Marking it as SLOW now.

[Andrey Kosyakov]

This also caused http/tests/security/contentSecurityPolicy/policy-does-not-affect-child.html to flake on linux:

http://test-results.appspot.com/dashboards/flakiness_dashboard.html#showExpectations=true&tests=http%2Ftests%2Fsecurity%2FcontentSecurityPolicy%2Fpolicy-does-not-affect-child.html%2Cfast%2Fframes%2Fsandboxed-iframe-navigation-windowopen.html

[Andrey Kosyakov]

... as well as http/tests/security/contentSecurityPolicy/object-src-none-allowed.html:

http://test-results.appspot.com/dashboards/flakiness_dashboard.html#showExpectations=true&tests=http%2Ftests%2Fsecurity%2FcontentSecurityPolicy%2Fobject-src-none-allowed.html%2Chttp%2Ftests%2Fsecurity%2FcontentSecurityPolicy%2Fpolicy-does-not-affect-child.html

[Adam Barth]

99138 got rolled out

[Stephen Chenney]

Marking test failures as WontFix. Bug is still accessible and recording in TestExpectations.