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This was broken by
https://chromium.googlesource.com/chromium/src/+/31c2066fb04ade8b1474c27054f425fe8a72d04f

Tested interactively using repro steps on bug.

Also re-enables programmatic test for this bug.

Bug: 789913
Change-Id: I43a59ef112da6f1e69c30a46c55586d5f9280f41
Reviewed-on: https://chromium-review.googlesource.com/804676
Commit-Queue: Mark Pearson <mpearson@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521203}