Revert 224562 "Whitelist the security token apps to be externall..."

It's not needed anymore, added complexity, and it doesn't actually work
propertly, so reverting.


> Whitelist the security token apps to be externally_connectable from incognito
> profiles.
> 
> BUG=295845
> R=yoz@chromium.org
> 
> Review URL: https://codereview.chromium.org/24141008

TBR=kalman@chromium.org

Review URL: https://codereview.chromium.org/29693002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@229454 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 229454