Disable WebUIWebViewBrowserTest* on Site Isolation FYI bots.
A new test, WebUIWebViewBrowserTest.ExecuteScriptCodeFromFile, is
failing on the Site Isolation FYI bots. This filter tweak should
disable this test as well as any future tests in WebUIWebViewBrowserTest, since these failures are expected in
--site-per-process mode.
BUG=465589
TEST=Site Isolation FYI bots go green.
TBR=jam@chromium.org
Review URL: https://codereview.chromium.org/
1042863003
Cr-Commit-Position: refs/heads/master@{#322826}