Remove workaround for flaky ClearSiteDataTest

Wait until BrowsingDataRemover is done before checking whether the
ServiceWorker has been removed.

Bug: 912313
Change-Id: Ic0e269b27554713a5f5327a33fa894c040e5c9bb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1617347
Auto-Submit: Christian Dullweber <dullweber@chromium.org>
Reviewed-by: Martin Šrámek <msramek@chromium.org>
Commit-Queue: Christian Dullweber <dullweber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#661353}
1 file changed