Fix leaks introduced by WDS change

Make sure tests give WDS time to shutdown its DB.

TBR=atwilson@chromium.org
(for Signin changes)

R=joi@chromium.org
BUG=222363

Review URL: https://chromiumcodereview.appspot.com/12847010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@189388 0039d316-1c4b-4281-b951-d872f2087c98
2 files changed