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They were disabled because they flakily time out.  Now with the switch
to Aura, I don't see timeouts anymore.  All the tests I enable in this
changelist pass 10/10 on my machine.

Trybots seem okay with it.

BUG=131179,165765

Review URL: https://codereview.chromium.org/517683002

Cr-Commit-Position: refs/heads/master@{#292459}