Fix flaky ClearSiteDataHandler test

To find out whether the flaky test is caused by a timing issue or if
there is an actual problem, a short timeout is added.

Bug: 912313
Change-Id: Iff4ff88fc64fa8addc0ff1f001aee7ba3bba0015
Reviewed-on: https://chromium-review.googlesource.com/c/1367644
Reviewed-by: Martin Šrámek <msramek@chromium.org>
Commit-Queue: Christian Dullweber <dullweber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#614687}
1 file changed