[Mac] Disable Omnibox editing in popup windows.
[Mac] Disable Omnibox editing in popup windows.

http://crbug.com/20243
TEST=Go to www.popuptest.com.  Select test #2, allow one of the popups
through.  Try to edit in the omnibox.  Should be able to select and
copy, but not enter text.

Review URL: http://codereview.chromium.org/183043

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@25351 0039d316-1c4b-4281-b951-d872f2087c98

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