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This test was flaky because the reported data savings was sometimes
zero. I was unable to repro locally, but adding another navigation
afterwards should help a lot and I'll keep tabs on it with FindIt.

Bug: 915775
Change-Id: Ib55370ed3ccdd4e047acfe30ca342d9693a560bc
Reviewed-on: https://chromium-review.googlesource.com/c/1392598Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Commit-Queue: Robert Ogden <robertogden@chromium.org>
Cr-Commit-Position: refs/heads/master@{#619496}