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Hopefully the move will make DesktopWindowTreeHostX11Test.Deactivate no longer
flaky. Only a single window can be active at a time. I suspect that this test
sometimes fails when run in parallel with other tests

BUG=396491
TEST=None

Review URL: https://codereview.chromium.org/414123005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@285834 0039d316-1c4b-4281-b951-d872f2087c98