We should probably merge https://chromium.googlesource.com/chromium/blink/+/08ecc23c4d80be9969918c4baf0ac83dc6cb6cbd
Corrected UA style for a:focus in simpleUserAgentStyleSheet.
simpleUserAgentStyleSheet did not have an outline on a:focus like html.css.
The result was flakiness for the following test depending on whether the full
UA styles had been triggered by a previous test or not:
Created attachment 216130 [details]
Merges the fix
Committed r158722: <http://trac.webkit.org/changeset/158722>