Revert 225492 "Revert 225155 "Keep running mdns client even if e..."

> 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

TBR=vitalybuka@chromium.org

Review URL: https://codereview.chromium.org/24813006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@225566 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 225566