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The test needs to wait for the 'keystatuseschange' event to ensure
the key statuses have been updated properly.

BUG=896162
TEST=RemoveTemporarySession tests pass with the additional CL in the bug.

Change-Id: I066743332a575b384db478829cdf4b87cc54606d
Reviewed-on: https://chromium-review.googlesource.com/c/1287439Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Commit-Queue: John Rummell <jrummell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#602182}