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We had turned it off because the tests were leaking memory.  They are
not leaking anymore so I am turning them back on.

Bug: 969160
Change-Id: I9b61f4f4f71010778e95b54a18881147c9eaf777
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1900435
Commit-Queue: James Hollyer <jameshollyer@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714641}