Re-enable app search from omnibox tests on Mac, since crbug.com/98801 is now fixed and stay green on all pyauto bots.
Re-enable app search from omnibox tests on Mac, since crbug.com/98801
is now fixed and stay green on all pyauto bots.

BUG=98801
TEST=re-enable tests

Review URL: http://codereview.chromium.org/8283017

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@105444 0039d316-1c4b-4281-b951-d872f2087c98

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