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These tests are timing out periodically. Match the removal of
browser_tests, since the behavior is expected to be the same.

Bug: 876224
Change-Id: I76183e78fde8f10a1feae67db51ca4336a4c652e
Reviewed-on: https://chromium-review.googlesource.com/1197322Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587675}