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Also update the browser_tests for renewal messages to verify that at least
one renewal message was actually received.

BUG=
TEST=browser_tests for renewal still work

Change-Id: Idad0059aec02dae4f0910fd9f39846c0a4ac660f
Reviewed-on: https://chromium-review.googlesource.com/569198Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Commit-Queue: John Rummell <jrummell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488467}