Enable omnibox.OmniboxTest.testOmniboxSearchHistory.
Enable omnibox.OmniboxTest.testOmniboxSearchHistory.

BUG=None
TEST=Ran 50 times on win7/vista

Change-Id: Ic9b488b1687896cb538564427d64a48654ef689b

Review URL: http://codereview.chromium.org/8071016

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@103393 0039d316-1c4b-4281-b951-d872f2087c98

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