about:omnibox - add current page classification to possible settings

It's a bit ugly--I wish I could get the text and the dropdown indented a bit (the width of one checkbox) so it lines up with the other text. But it's not a big deal and not worth my time figuring out.

BUG=265675

Review URL: https://codereview.chromium.org/149683005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247854 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247854