Revert 225155 "Keep running mdns client even if either IPv4 or I..."

BUG=298768

> Keep running mdns client even if either IPv4 or IPv6 bind failed.
> 
> BUG=297212
> NOTRY=true
> 
> Review URL: https://chromiumcodereview.appspot.com/23498056

TBR=vitalybuka@chromium.org

Review URL: https://codereview.chromium.org/24486005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@225492 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 225492