Switch AutomationProxyVisibleTest.AutocompleteMatchesTest from DISABLED to FLAKY on Windows and Linux (required infrastructure is still not available on Mac).
Switch AutomationProxyVisibleTest.AutocompleteMatchesTest from DISABLED
to FLAKY on Windows and Linux (required infrastructure is still not
available on Mac).

There is a slight possiblity that the flakiness has disappeared,
but I don't think so. We're going to get more accurate data
from the flakiness report.

TEST=AutomationProxyVisibleTest.AutocompleteMatchesTest
BUG=19876

Review URL: http://codereview.chromium.org/1530004

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@43063 0039d316-1c4b-4281-b951-d872f2087c98

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