Mark http/tests/event-timing/event-timing-retrievability.html as timing out

TBR=pmonette@chromium.org

Bug: 856601
Change-Id: Idac2114ffb81e7e02acf75b8b30f194cfa51c6a1
Reviewed-on: https://chromium-review.googlesource.com/1128967
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#573294}
1 file changed