Mark virtual/threaded/transitions/interrupted-all-transition.html as more flaky, as it now crashes

BUG=248938
TBR=junov@chromium.org

Review URL: https://codereview.chromium.org/111493004

git-svn-id: svn://svn.chromium.org/blink/trunk@163728 bbb929c8-8fbe-4397-9dbb-9b2b20218538