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It also makes sure that engines which have been removed from Firefox
are not imported into Chrome.

BUG= http://crbug.com/12245
TEST= Install firefox, and do not change the default search engines.
Start Chrome, and import search engines from Firefox.  Default Firefox
engines should now be part of Chrome.


Review URL: http://codereview.chromium.org/115895

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@17207 0039d316-1c4b-4281-b951-d872f2087c98