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This CL is a followup to:
https://chromium-review.googlesource.com/c/chromium/src/+/2485561

It ports one more browser test to a unit test.

Bug: 751031
Change-Id: I56928ef473e3a14982c2fec0d900176c3175de9f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2485562
Commit-Queue: Tommy Li <tommycli@chromium.org>
Reviewed-by: manuk hovanesian <manukh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818958}