Disabling a search engine pyauto test that's flaky on Mac.
Disabling a search engine pyauto test that's flaky on Mac.

This test appears to fail only when run in the background.

BUG=69619
TEST=search_engines.SearchEnginesTest.testDiscoverSearchEngine
Review URL: http://codereview.chromium.org/7031066

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@86740 0039d316-1c4b-4281-b951-d872f2087c98

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