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Otherwise if the devices are gone lots of tests will just fail.

Already fixed this for recipe based builders in crbug.com/393681

I don't know how to test this, but happy to write one if shown.

BUG=393681
NOTRY=True

Review URL: https://codereview.chromium.org/390993003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@283890 0039d316-1c4b-4281-b951-d872f2087c98