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The browser test times outs and causes flakes. There are 2 wait events
that could cause timeouts: blocklist loaded and a histogram check.

This CL uses the updated blocklist loaded provided by the delegate which
which more clearly marks when the blocklist is loaded.

This CL also shifts the tab closing later to remove potential race of
the hint check logic with the tab closing. A future change will remove
the tab closing logic that may improve this further.

Bug: 1122603
Change-Id: I898096f3350c057a14661163a8b99ac04fedd299
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2380153Reviewed-by: Sophie Chang <sophiechang@chromium.org>
Commit-Queue: Michael Crouse <mcrouse@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802341}