Mac: fix Esc-killing-Omnibox-focus problem (after find bar shown).
Mac: fix Esc-killing-Omnibox-focus problem (after find bar shown).

BUG=33094
TEST=Open a new browser window; Cmd-F to show the find bar; Esc to hide the find bar; focus the Omnibox; press Esc a few times (with or without editing its contents); focus should remain in the Omnibox. Make sure showing/hiding/using the find bar works normally.

Review URL: http://codereview.chromium.org/561055

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@38030 0039d316-1c4b-4281-b951-d872f2087c98

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