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This test was disabled with MSAN due to the race condition in
OnReceivedThreatDOMDetails. Repeated local runs with MSAN now succeed,
so I think it's safe to re-enable.

Bug: 860445
Change-Id: I4d01568c79562ac1125c4410dbe2c52c17056c2d
Reviewed-on: https://chromium-review.googlesource.com/1149260Reviewed-by: Jialiu Lin <jialiul@chromium.org>
Commit-Queue: Daniel Rubery <drubery@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577959}