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This patch changes "add language" overlay page in chrome://settings/language
from listed links to drop-down menu.

This patch only affects Chrome OS settings page.

BUG=133346
TEST=try bots

Review URL: https://chromiumcodereview.appspot.com/12087105

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@182203 0039d316-1c4b-4281-b951-d872f2087c98