Whitelists informational string to be used by the Settings UI on iOS.

BUG=322476

Review URL: https://codereview.chromium.org/85713003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237090 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 237090