console-filter-test.html is flaky on debug bots too.

BUG=406283
TBR=hclam@chromium.org

Review URL: https://codereview.chromium.org/530723002

git-svn-id: svn://svn.chromium.org/blink/trunk@181178 bbb929c8-8fbe-4397-9dbb-9b2b20218538